BuyCostumes.com is a major US-based costume retailer headquartered in New Berlin, Wisconsin. It is an e-commerce company that sells costumes and costume accessories for children, adults and pets, as well as party supplies for year-round occasions and seasonal indoor/outdoor décor. It is part of a family of costume and party brands owned by a larger corporate entity, BuySeasons, Inc. that includes CostumeExpress.com, BirthdayExpress.com, CelebrateExpress.com, and 1stWishes.com. BuySeasons, Inc.