If they like what they wear, then good for them. I don't think any of us has the right to criticize the way another person dresses just because skinny people tend to look better in outfits. Who says overweight people have to stick to wearing loose fitting clothes? I don't particularly like it when people purposely try to squeeze into a top that's too small for them, but if they feel that they look better in those than they do in unflattering styles of plus-size clothing, then that's their prerogative.