There are 6 Official Costumes coupons that include promo codes and deals for May 2017 for you to choose from. Our top coupon for today is a 5% Off coupon code. You can use your coupon code to save on costumes for any occasion at Official Costumes. Get the hottest costumes of the season right here. It doesn't matter if it's Halloween or not - dress up anytime with great pop culture characters, animal costumes and more. Shop for men, women, kids and even pets!