I have often told actresses that they have to develop a sense of personal style, and that to prepare for stardom they must acquaint themselves with clothing that is chic, and wear their brand every day.
Virtually none of them get it. Frankly, I think it's because few of them have lived in Manhattan, and they don't keep up on fashion.
Here's my initial advice: subscribe to British Vogue. It's expensive, but you need it.
Lots of girls hang out and audition in sweats or yoga tops and pants. I'll tell you who can get away with that, and I've seen it with my own eyes: Jennifer Love Hewitt. If you saw her with no underwear and clingy yoga garb, your brain would melt.
For everyone else in LA, I have a list of boutiques where true fashion can be found. The sad thing is that when I've bought gifts for clients from these shops, they actually won't wear them. If it's not trash, it's too weird and scary .
Wanna be a star? Be great at your craft and learn to dress: