I think you just have to be comfortable in your skin. But, I'm a nudist in any case. I've never had a problem with my body and I don't really care what people think, so I have bottoms on and pretty much go topless, or also when we shoot - we did a lot of nude pictures today, too - it doesn't bother me in the slightest.
Discussing her ease with nude photo shoots, as quoted in Allure Magazine, May 2012