Product purchased with a coupon may be exchanged/refunded. The amount to be refunded will be the price of the item less the coupon price. However, if the price of the item to be refunded is less or equal to the coupon price, the amount to be refunded will be the price of the item indicated on the receipt. The coupon will be revived only if the item to be refunded is damaged, defective or faulty.
To know more about the return policy kindly refer to this link: https://faq-ph.uniqlo.com/articles/en_US/FAQ/Returns-Policy/