Originally Posted by
anabolism
I'm always hot on planes and would be much more comfortable sleeping topless, but always assumed it would make others uncomfortable. Does it matter than I'm in reasonable shape?

Not sure merely 'reasonable' would cut it at this day and age when we've got such unrealistic expectations of body image - on both sexes.
A CalvinKlein underwear model physique would pass muster, but how many of us actually (care to) have (and maintain!) such a build?