When you go shopping do you just know your size and pick everything up in that size and check out. Then just try everything on when you get home. If so, do you find everything fits you.
Personally I have to try everying on. And if it doesn't sit right then I don't buy it. Thats why I find buying online so difficult. I love these threads and see so many fab web sites with lovely stock but I know right well if I buy something, it will arrive in the post, and something will be wrong with the way it fits me and i'll never wear it.

Same with shoes. I'm a size 39. But one foot is bigger than the other and it makes it difficult to buy shoes. Sometimes I'd love to run out the door with a 5 in one shoe and a 6 in the other. :P