...if I knew something would fit me well and was made of a generally comfortable material like 100% cotton, I would probably order it.
But what if the new item you were looking at was very fancy to your eye, but was made with a new material blend that just came out? Say a funky Poly/cotton/carbon fiber blend? Would you buy it outright and go through the trouble of having to return it if you didn't like it, or rather be able to try it out in a store before buying, and if you didn't like it, go over to the 100% cotton aisle since you are already there?