Fatjoned:
Just do it! First thing I do At the beech is whip my top off then see who starts looking. You can spot the people who think I am discussing and others who are trying to get sneaky looks when laying with their partner or family - beleive me, there are more FAs out there than you think
the only places i bare my belly are typically at the beach and in the change room at the gym (i live in canada... it's cold a bunch of the year... seeing people without their shirts on is not a typical thing in day-to-day life).
most people don't care. even if they find it repulsive, 99% of the time they're just going to pass by and not think of you again.
at the beach, i would say the fat people who won't take their shirts off stand out more than those that do. you know how they say confidence is attractive, maybe the opposite stands out, too?