Just for fun - fashion pet peeves

I am admittedly fashion-challenged. But some trends I just don't get. Examples: 1. Thongs = butt floss 2. Cold shoulder tops: wear sleeves or don't. But don't try to have it both ways. 3. Waist trainers: How is squishing internal organs healthy? 4. Extra strappy bras and lingerie: Aren't regular bras difficult enough to contort oneself into without getting tangled up in two dozen extra straps? What are some fashion trends you just don't get?