I've gone back and forth on the issue. I weighed 230 pounds my freshman year of highschool. I'm 6'3" to 6'4" depending on my footwear at the time, so it isn't as bad as it might have sounded, but it was pretty bad. I wouldn't go swimming without a t-shirt, that whole deal. So then, nudity was a big no no.
After I got into martial arts and body conditioning and shrank down to 169 pounds, I was almost always in some varying degree of undress. It was a big "ha, look at me!" phase. But, I'd overdone it and people were accusing me of having an eating disorder. 169 pounds on my frame just wasn't enough. The long sleeve shirts came back, even in summer, and I wore huge jnco jeans to give myself the illusion of width.
I finally settled down around 25-26 where I had a healthy athletic weight for my build. I was a lot more confident than I'd been before. There were pictures. So yeah, nudity was pretty much okay at that point. My fitness regime actually cost me my girlfriend at the time though, because she felt I was hypercritical of her body (which I wasn't) because I kept trying to get her to work out with me (just to make more time together, since I was far enough overboard on it to refuse giving up my workouts and she worked a ton of hours at her job). I partially disrobed at a couple of my band's shows, one time getting a little too caught up with the audience and flirting with the definition of indecent exposure.
Being naked in public? Not so much now that I'm a few years older and have a couple of health concerns preventing me from hammering my body back into the kind of shape it should be in. However, around the house, I just don't care that much anymore. If I can get away with being in boxers (or less) and just running a fan, that works better than being in full dress and wasting electricity on my grossly inefficient air conditioner.