I can be pretty insecure about my body. I used to really not care for my body at all, so I just sort of ignored it. But it's unhealthy, both physically and mentally, to do that, and eventually I realized that, so I started caring. A lot. I've recently lost a lot weight and been getting in better shape, although I actually feel more self-conscious and insecure about my body and my looks. I kind of jumped from one extreme to the other, and I'm just trying to adjust and find an accepting balance.
I honestly realize that my concerns about my appearance are most likely distorted and blown out of proportion, but part of me can't help it. Comfort with myself will come in time though, I'm making progress. Nobody should be ashamed of their body.
Personally, I couldn't care less what people wore or didn't wear. It doesn't matter. People should be able to express themselves with their body how they see fit.