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Limited-Time Offer | 12% off AU$830+ | 18% off AU$1,150+ | 25% off AU$1,900+. SHOP WOMEN SHOP MEN T&C apply

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

Welcome Offer | Subscribed to enjoy special offer on your first full-price purchase. T&C apply.

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Men'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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Clinton Blazer in Precision Ponte

null ~~Price reduced from to~~ AU$ 765.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

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Precise Tee in Cotton Jersey

null ~~Price reduced from to~~ AU$ 150.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

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Zaine Trousers in Precision Ponte

null ~~Price reduced from to~~ AU$ 450.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

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Chambers Blazer in Stretch Wool

null ~~Price reduced from to~~ AU$ 1,050.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

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Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ AU$ 360.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

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Precise Tee in Cotton Jersey

null ~~Price reduced from to~~ AU$ 150.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

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Mayer Trousers in Stretch Wool

null ~~Price reduced from to~~ AU$ 430.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

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Clinton Blazer in Precision Ponte

null ~~Price reduced from to~~ AU$ 765.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

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Ryder Tee in Relay Jersey

null ~~Price reduced from to~~ AU$ 230.00

Purchase 3 Pieces to Unlock Bundle Price

Raffi 5-Pocket Trousers in Neoteric Twill

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Raffi 5-Pocket Trousers in Neoteric Twill

null ~~Price reduced from to~~ AU$ 360.00

Purchase 3 Pieces to Unlock Bundle Price

Quick Add

Chambers Blazer in Stretch Wool

null ~~Price reduced from to~~ AU$ 1,050.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% Off

Quick Add

Sylvain Shirt in Structure Knit

null ~~Price reduced from to~~ AU$ 360.00

Limited-Time Offer | 12% off AU$830+ & Up to 25% 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.

KELSO SPECIAL OFFER
(1) Promotional Period: The Promotional Period is from 1 August 2026 to 30 September 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 OFFER – BUY MORE SAVE MORE
(1) Promotional Period: The Promotional Period is from 25 September, 2026 to 7 October, 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 the following discounts (collectively the “Discount”) upon meeting the following designated purchase threshold in one single transaction at Theory Online Stores: (1) 12% off upon a single purchase of AU$830; and (2) 18% off upon a single purchase of AU$1,150; and (3) 25% off upon a single purchase of AU$1,900. The Discount will automatically apply at checkout. (4) General Terms and Conditions: The Discount does not apply to Bundles items, permanent/core and discounted products (the “Excluded Products”). The Excluded Products can be counted toward the accumulated spending amount. 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.