And of course you reported what you saw him doing and he was arrested. Right? Right???

If you're not part of the solution (reporting inappropriate or lewd behaviour) then in effect you are allowing it to continue by doing nothing.

We all have a responsibilty of care for each other - yes underdressing is stupidly ignorant and culturally inappropriate and offensive - but your decision to do nothing (which is apparently the case? Please correct me if I am wrong) but post your complaint here does nothing to improve the situation