I haven't been overweight since the seventh grade, but I've had 'moobs' with puffy nipples ever since then. I felt very awkward about them as a boy, so I haven't gone topless all that often. Now, with a large A cup, I wouldn't consider it at all.
When I'm with friends, though, I do like to flash them nonchalantly.

Like, if we were sitting around gabbing and their attention was away from me, I might pull one out and act like nothing was unusual. It's fun to see how long it takes them to notice.