If you've taken the time to look at my personal closets (1, 2, 3), then you'll see that I both fold and hang my sweaters but there's a very clear methodology behind my decision. Pullover sweaters, or classic sweaters, should absolutely be folded. You'd never hang a long-sleeve shirt, so why would you hang what is essentially a thicker version of a long-sleeve shirt? Particularly when talking about knitted sweaters, hanging them from hangers will only cause the fabric to stretch unevenly and look very unflattering on your body. So, conclusion: always fold pullover sweaters.Â
Cardigans, however, can be a little different. As long as they aren't knit or another fabric that will easily stretch, I like to hang my cardigans. I find that it looks much nicer when placed next to jackets, and they're easier to grab.Â