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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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The Pant Guide

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Theory Wardrobe

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Moonsoft Cotton

Crisp. Flexible. Cotton without constraint.

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Zaine Trousers in Moonsoft Cotton

null ~~Price reduced from to~~ NT$ 8,550

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

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Zaine Trousers in Moonsoft Cotton

null ~~Price reduced from to~~ NT$ 8,550

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

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Button-Up Cardigan in Light Bilen

null ~~Price reduced from to~~ NT$ 11,400

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Sweatpant in Light Bilen

null ~~Price reduced from to~~ NT$ 9,650

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Turtleneck Cardigan in Light Bilen

null ~~Price reduced from to~~ NT$ 11,400

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Life in Linen

Quiet moments featuring spring’s quintessential fabric.

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World of Bilen

The smarter standard in knitwear.

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Clothes that keep up with your calendar.

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Zaine Trousers in Precision Ponte

null ~~Price reduced from to~~ NT$ 8,550

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Clinton Blazer in Precision Ponte

null ~~Price reduced from to~~ NT$ 17,100

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Ryder Tee in Relay Jersey

null ~~Price reduced from to~~ NT$ 5,050

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Ryder Tee in Relay Jersey

null ~~Price reduced from to~~ NT$ 5,050

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Ryder Tee in Relay Jersey

null ~~Price reduced from to~~ NT$ 5,050

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Mayer Trousers in Stretch Wool

null ~~Price reduced from to~~ NT$ 9,650

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Crewneck Sweater in Regal Wool

null ~~Price reduced from to~~ NT$ 8,550

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Sylvain Shirt in Good Cotton

null ~~Price reduced from to~~ NT$ 7,250

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Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ NT$ 7,250

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Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ NT$ 7,250

Raffi 5-Pocket Trousers in Neoteric Twill

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Raffi 5-Pocket Trousers in Neoteric Twill

null ~~Price reduced from to~~ NT$ 8,550

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Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ NT$ 7,250

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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.

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.