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Limited Time Offer on Suiting - 2+ Get 20% off* SHOP WOMEN SHOP MEN T&C Apply

Shop 2+ Selected Kelso collection get extra offer* SHOP NOW T&C apply

Buy More, Save More | Purchase two on-sale styles to enjoy extra savings. SHOP WOMEN SHOP MEN

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Women's Bestsellers

Theory is known for our timeless essentials. Discover everything you need to complete your wardrobe, from work to weekend.

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Etiennette Blazer in Good Wool

null ~~Price reduced from to~~ HK$ 3,400.00

Limited Time Offer - Buy 2+ Full Price items Get 20% Off

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Sleeveless Fitted Dress in Good Wool

null ~~Price reduced from to~~ HK$ 2,400.00

Limited Time Offer - Buy 2+ Full Price items Get 20% Off

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Staple Blazer in Admiral Crepe

null ~~Price reduced from to~~ HK$ 4,700.00

Limited Time Offer - Buy 2+ Full Price items Get 20% Off

Sleeveless Fitted Dress in Wool Gabardine

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Sleeveless Fitted Dress in Wool Gabardine

null ~~Price reduced from HK$ 2,400.00 to~~ HK$ 1,200.00

Buy 2+ Extra Saving*

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Carissa Blazer in Good Wool

null ~~Price reduced from to~~ HK$ 3,100.00

Limited Time Offer - Buy 2+ Full Price items Get 20% Off

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Flared Dress in Admiral Crepe

null ~~Price reduced from to~~ HK$ 3,300.00

Limited Time Offer - Buy 2+ Full Price items Get 20% Off

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Flared Dress in Admiral Crepe

null ~~Price reduced from to~~ HK$ 3,300.00

Limited Time Offer - Buy 2+ Full Price items Get 20% Off

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Flared Dress in Admiral Crepe

null ~~Price reduced from to~~ HK$ 3,300.00

Limited Time Offer - Buy 2+ Full Price items Get 20% Off

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Crewneck Sweater in Regal Wool

null ~~Price reduced from to~~ HK$ 1,850.00

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Crewneck Sweater in Regal Wool

null ~~Price reduced from to~~ HK$ 1,850.00

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Shell Top in Silk Georgette

null ~~Price reduced from to~~ HK$ 1,750.00

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Flared Trousers in Good Wool

null ~~Price reduced from to~~ HK$ 2,100.00

Limited Time Offer - Buy 2+ Full Price items Get 20% Off

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WELCOME OFFER
(1) Promotional Period: From April 1, 2024 until further notice. (2) Eligibility: Customers who successfully subscribe to Theory Newsletters during the Promotional Period (“Eligible Customers”). (3) Designated Store in respect of this Promotion: The new Theory Online Store at hk.theory.com, tw.theory.com, sg.theory.com and au.theory.com (collectively “Theory Online Stores”). (4) How to enjoy this Promotion: Eligible Customers can enjoy 15% off on regular-priced products at Theory Online Stores (subject to the Excluded Products as defined below) (the “Discount”) by entering the promotional code at checkout. The promotional code would be sent, via email, to Eligible Customers upon successful newsletter registration. (5) General Terms and Conditions: The Discount only applies to the first order placed by Eligible Customers on Theory Online Stores. The Discount does not apply to the purchase of Theory Project products, Bundles and permanent/core items (the “Excluded Products”). The Discount cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.

BUNDLE PROMOTION
(1) Promotional Period: The Promotional Period is from 1 July, 2025 until further notice. (2) Designated Store in respect of this Promotion: Theory Online Store at hk.theory.com, tw.theory.com, sg.theory.com and au.theory.com (collectively “Theory Online Stores”). (3) How to enjoy this Promotion: During the Promotional Period, all customers can enjoy an additional discount upon purchasing, as the case maybe, 2 or 3 items of the same style (as may be designated by Theory from time to time) in any size or color (collectively the “Designated Items”) in one single transaction at Theory Online Stores (collectively the “Discount”). The Designated items, and the number of Designated Items required to be purchased to unlock the Discount, will be specifically marked on Theory Online Stores. Customers are required to add the Designated Items into bag to unlock the amount of the Discount. The Discount will automatically apply at checkout. (4) General Terms and Conditions: The Discount cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.

STUDENT PROGRAM
(1) Promotional Period: The Promotional Period is from September 15, 2025 to August 31, 2026 (both days inclusive). (2) Eligibility: (i) Undergraduate and postgraduate students at universities in Hong Kong (the “University Students”); and (ii) University Students graduating in the year of 2025 (collectively the “Eligible Customers”). (3) Designated Store in respect of this Promotion: Theory Online Store at hk.theory.com (collectively “Theory Online Store”). (4) How to enjoy this Promotion: During the Promotional Period, Eligible Customers can enjoy a 25% discount on selected items (the “Discount”) at Theory Online Store by emailing a soft copy of a valid university student card issued by any universities in Hong Kong (the “Valid Student Card”) to our Customer Service team at customerservicehk@theory.com to verify identity. Upon successful verification, Eligible Customers would receive a unique, single use promotional code (the “Promotional Code”) via email. Eligible Customers can enjoy the Discount by inserting the Promotional Code at checkout. For verification purpose, University Students grading in the year of 2025 shall provide a Valid Student Card which shall remain valid within the year of 2025. (5) General Terms and Conditions: The Discount does not apply to Bundles. The Promotional Code would expire once used. Save and except designated gift offers designated by Theory from time to time, the promotion cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, shopping mall loyalty program discounts (where applicable), other Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. Customers who provide inaccurate information would not be eligible to enjoy this promotional offer. This promotional offer cannot be used in conjunction with Theory staff discount. To enjoy this promotional offer, Eligible Customers agree and acknowledge that our Customer Service team is entitled to receive a soft copy of the Valid Student Cards for verification and record-keeping purpose. By participating in the promotion, Eligible Customers are deemed to agree with and be bound by these Terms and Conditions and Theory's Privacy Policy at https://hk.theory.com/privacy-policy_hk.html. Eligible Customers agree and acknowledge that Theory will only use the personal data collected for the purposes of this promotional offer, and the information will be kept strictly confidential. Unless otherwise agreed by the Eligible Customers, their personal data will not be used for any other purpose (including but not limited to direct marketing purpose) and will be destroyed after the relevant purposes are completed. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.

HANG SENG YEAR-ROUND OFFER
(1) Promotional Period: The Promotional Period is from 1 February, 2026 to 31 December, 2026 (both days inclusive). (2) Eligibility: Hang Seng Credit Card Holders (collectively the “Eligible Customers”). (3) Designated Store in respect of this Promotion: (i) Hong Kong Online Store at hk.theory.com; and (ii) Theory Stores at Pacific Place, ifc mall, Lee Garden Two, Harbour City, New Town Plaza, Cityplaza (collectively “Theory Physical Stores”, together with Theory Online Store, the “Theory Stores”). (4) How to enjoy this Promotion: During the relevant Promotional Period(s), Eligible Customers can enjoy a 10% discount on regularpriced items at Theory Stores (the “Discount”) by fully settling all spending in respect of the relevant transaction by Hang Seng Credit Card. To enjoy the Discount for purchases made at Theory Online Store, Eligible Customers must enter the promotional code “theoryhs” provided to Eligible Customers at checkout. (5) General Terms and Conditions: The Discount does not apply to Bundles and permanent/core items. Save and except shopping mall coupons (where applicable) and designated gift offers designated by Theory from time to time, the promotion cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, shopping mall loyalty program discounts (where applicable), other Credit Card Year-Round Discount and Theory CRM Coupons). The promotion cannot be transferred nor exchanged for cash or any other gifts or coupons. This promotional offer cannot be used in conjunction with Theory staff discount. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute. The Chinese version of these Terms and Conditions is for reference only. In case of discrepancy between the Chinese and English versions of these Terms and Conditions, the English version shall prevail.

FINAL SALE BUY MORE SAVE MORE OFFER
(1) Promotional Period: The Promotional Period is from 26 June, 2026 to 31 August, 2026 (both days inclusive). (2) Designated Store in respect of this Promotion: Theory Online Store at hk.theory.com, tw.theory.com, sg.theory.com and au.theory.com (collectively “Theory Online Stores”). (3) How to enjoy this Promotion: During the Promotional Period, all customers can enjoy an extra 10% discount (the “Discount ”) on discounted items (to be selected/designated by Theory at its discretion) (the “Discounted Items”) upon the purchase of two discounted items (the “Purchase Threshold”), in one single transaction at any Theory Online Stores. The Discount will automatically apply at checkout. (4) General Terms and Conditions: The Discount only applies to the Discounted Items. Discount cannot be used in conjunction with any other discounts, promotional offers and ts/Theory VIP Birthday discounts, shopping mall loyalty program discounts, Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. No exchange or return would be provided for products purchased with the Discount under this promotion. This promotional offer cannot be used in conjunction with Theory staff discount. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.

KELSO SPECIAL OFFER
(1) Promotional Period: The Promotional Period is from 1 August 2026 to 31 August 2026 (both days inclusive). (2) Designated Store in respect of this Promotion: Theory Online Store at hk.theory.com, tw.theory.com, sg.theory.com and au.theory.com (collectively “Theory Online Stores”). (3) How to enjoy this Promotion: During the Promotional Period, all customers can enjoy 25% off (the “Discount”) upon the purchase of two regular-priced Kelso items in one single transaction at any Theory Online Stores. The discount applies to regular-priced items only, and does not apply to any other products. The Discount will automatically apply at checkout. (4) General Terms and Conditions: This promotion only applies to regular-priced items, and does not apply to Bundles and discounted products. The Discount cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to Theory VIP discounts/Theory VIP Birthday discounts, Credit Card Year-Round Discount and Theory CRM Coupons). The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. This promotional offer cannot be used in conjunction with Theory staff discount. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.

LIMITED TIME SUITING OFFER
(1) Promotional Period: The Promotional Period is from 7 August 2026 to 23 August 2026 (both days inclusive). (2) Designated Store in respect of this Promotion: (i) Theory Online Store at hk.theory.com, tw.theory.com, sg.theory.com and au.theory.com (collectively “Theory Online Stores”). (ii) Theory Stores at Pacific Place, ifc mall, Lee Garden Two, Harbour City, New Town Plaza, Cityplaza (collectively “Theory Physical Stores”, together with Theory Online Stores, the “Theory Stores”). (3) How to enjoy this Promotion: During the Promotional Period, all customers can enjoy an extra 20% discount (the “Discount”) on selected items of Jacket, Pants and Dress (the “Suiting Items”) upon the purchase of at least two items of Jacket, Pants and Dress (the “Purchase Threshold”), in one single transaction at any Theory Stores. The Discount will automatically apply at checkout. For the avoidance of doubt, the purchase of a set of Pants Bundles shall be counted as the purchase of one item only within the Purchase Threshold. The sets of Bundles in other categories are not counted in this promotion. (4) General Terms and Conditions: The Discount only applies to the Selected Suiting Items, and does not apply to any other items and discounted items (including but not limited to regular priced items and Bundles). Save and except shopping mall coupons and designated “Gift With Purchase” offers, the Discount cannot be used in conjunction with any other discounts, promotional offers and coupons (including but not limited to shopping mall loyalty program discounts, Credit Card Year-Round Discount and Theory CRM Coupons). Subject to these terms and conditions, items purchased under other promotions specifically designated by Theory would be included in the Purchase Threshold. The Discount cannot be transferred nor exchanged for cash or any other gifts or coupons. Theory reserves the right to amend these Terms and conditions without prior notice. Theory reserves the right of final decision in case of any dispute.