Karmaloop How Do Clothing Companies Get Their Merchandise Sold On Major Retailing Websites? (Karmaloop)?

How do clothing companies get their merchandise sold on major retailing websites? (Karmaloop)? - karmaloop

Some friends and I are starting a business. We are all students, and as you might think that we have big dreams and a few innovative concepts. In wonder how these companies find their real clothes, clothes that are sold by major retailers?