I hate the way they size things these days. Everything that is labeled size seven should actually be a seven. It makes buying clothes a nightmare. I've got jeans in my closet labeled with everything from size five to size nine; ironically they are all the same size...
Dunno about jeans, but one thing I know about large clothing is that once you get past 2X, not all the sizes are standardized. I've had two shirts, supposedly the same size, one would fit comfortably and the other wouldn't.
The other problem I've run into is what I like to call "surprise shrinkage". That is, you buy a shirt, it fits fine, you wear it, you wash and then, boom, it's shrunk.
Between all that and the fact my skin was this weird reaction to polyester and anything with strips (I have NO clue why) it's hard for me to shop for clothes.