It's not intended to buy clothes from. It's a tool, kinda a game, where you put together outfits and enter contests. When you buy an outfit, it's more so that if you see something you like that you want you click it to go the the clothing to buy from the actual website of the brand. So it doesn't have "trustworthiness" or anything because you're buying it from the brand. But styling stuff it really fun. And anyone can add clothes to it. Polyvore doesn't add it, the members do.