Not to shill, but with Amazon Wardrobe, they explicitly expect you to send some of the products back. The other differences are that you are not billed until you decide what to keep and (to me, the biggest innovation), they use a box that is perforated with peel-and-stick strips for you to use to mail back and also include a pre-printed return label.

That last one is huge for me because the local UPS store got wise to Amazon returns and now charges $1.50 for the first printout, but only if you email them, which neatly captures everyone who needs to print a return label, but doesn't have a printer of their own.

I recently lost a lot of weight and so I wasn't sure what size I was for a lot of items. So I just ordered a couple different sizes and sent back the ones that didn't fit. Such a better experience than trying to find multiple sizes of the same thing in a store, then going to the dressing room where everything is counted because I'm assumed to be a criminal.

Biggest down side is that they use their very lowest priority and slowest shipping for it. But for me, clothes are rarely urgent.