Alright...
First thing I feel the need to do is go over some fashion basics. The following are trends (mostly long term since the last decade) that those ladies with fashion sense should know:
What's out:
Midriffs

What's in:
Long length shirts

What's out: 
Bell bottoms

What's in:
Skinny Jeans

What's out:
High heels

What's in: 
Wedges