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Dunno. Lots of men swim with T-shirts on to hide their man boobs. People have body issue problems, and I'm sure that is the real reason so many of those ladies wear burkinis - the religion is really being used as an excuse not to display cellulite, while their non-muslim counterparts buy various creams designed to solve the problem and then self-conscious wear sarongs etc to hide it on the beach.

Lots of men swim with T-shirts on to hide their man boobs

I've seen that trick being used!