Theory promo codes - 15% OFF for March 2026
Save up to 15% OFF with our 12 Theory promo codes and coupons, hand-tested by our savings experts.
FAQs
Can I get free shipping at Theory?
Yes, of course. Theory offers free ground shipping on all orders with no minimum spend. You can expect to receive your order within 3-5 business days. If you need your order sooner, faster shipping options are available for $13-$25.
Can I get 15% off at Theory?
Yes. As a new customer, you’ll be eligible to receive 15% off your first order when you sign up for the Theory newsletter. Simply pop your email in the newsletter sign-up box on their site.
Is there a Theory outlet?
Yes. You can shop the Theory outlet on their dedicated outlet site. There, you’ll find an abundance of clothing garments with as much as 70% off on selected items. This also includes 'last chance' items, which are reduced to clear.
What is the returns policy at Theory?
At Theory, the brand has a 30-day returns policy in case you’re not 100% satisfied with your purchase. Please note: items that are returned after 14 days of delivery will incur a small restocking fee of $9.95.
Hints and Tips
Welcome offer: Unlock an extra 15% off your first order as a new customer at Theory. Sign up to join the Theory mailing list to enjoy your money off, as well as being the first to hear all of the latest sales and clothing news.
Shop the sale: Discover all of your fashion favorites for less in the Theory sale. You can shop for chunky knits, blazers, trousers, and more with as much as $100 off. What’s more, the Theory sale takes place all year round, meaning you’ll have ample opportunity to save.
Student discount: Secure 15% off with the Theory student discount. Students and graduates need only to verify their student status through Student Beans to receive their money off. Redeem your unique code at checkout to enjoy more for less.
Article continues belowTheory app: Shop your wardrobe essentials with ease in the Theory app. While there's no app discount, you can still keep track of sale events. Once you’ve downloaded it, you’ll also be able to find new garments to add to your collection, place orders easily, and all with just a click of a button.
How to use your Theory promo code:
- Choose your Theory promo code from our Who What Wear discount codes.
- Head to the Theory website and start shopping.
- Continue to the checkout stage.
- Enter your Theory promo code into the promotional code box.
- Hit the 'Apply' button to secure your savings.
How do we source discount & promo codes?
Our team of deal experts are constantly searching for the best discount codes to help you save on the latest brands and fashion or beauty trends. This team specialises in scouring the web for the latest sales and discounts, hand-testing each one to make sure they’re working for you.
Our commercial colleagues are the ones who build key relationships with fashion and beauty brands, even offering exclusive discounts (you won’t find these anywhere else online). With the discounts agreed, the deals team can then add them to our pages for you.
Lastly, our editorial team covers everything from brand ‘about’ sections to need-to-know FAQs. You can expect essential sales information and advice for saving at trending beauty and fashion brands.
What if my promo code doesn’t work?
We pride ourselves on listing codes that will work which is why the team hand-tests each discount code. We also regularly update our pages to prevent any outdated promo codes being listed. Sometimes, a promo code might change or a sale might finish early without our knowledge. You can contact us at promocodes.whowhatwear@futurenet.com to let us know, should this happen.
How do we make money?
At WhoWhatWear, our vouchers section works by commission. Our carefully chosen selection of brands are published by our editors. Then, once you click through to the brand’s website and purchase your item, we’ll get a small percentage of that money from the brand.
We’ll drop a cookie when you use our link, which is how the brand can see you arrived through WhoWhatWear vouchers. It’s all about connecting you with brands we’d genuinely recommend to friends and family—and offering discounts for free!

Layla Al-Ani is a lifestyle and beauty writer. Since graduating with a degree in English Literature & Creative Writing, she has been producing written content aimed at helping people save on all things home, health, and lifestyle. When she’s not writing about the best promo codes and deals, she enjoys searching for inspiration for her next home project or finding new ways to practise self-care.
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About Theory
Theory is a contemporary clothing brand known for its beautifully crafted garments that ooze sophistication and class. Since being founded in New York in 1997, the retailer has set out to offer timeless fashion essentials tailored to level up your look. From chic blazers and fitted suit trousers to elegant dresses, Theory ensure that every fabric and fit is chosen with the utmost quality in mind. Discover the secret to an effortless capsule wardrobe and refine your everyday staples with ease. Even better, save when you shop with one of our verified Theory promo codes.
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Layla Al-Ani
Contributing Writer
Layla Al-Ani is a lifestyle and beauty writer. Since graduating with a degree in English Literature & Creative Writing, she has been producing written content aimed at helping people save on all things home, health, and lifestyle. When she’s not writing about the best promo codes and deals, she enjoys searching for inspiration for her next home project or finding new ways to practise self-care.





























