I agree, I have been on three cruises and really never saw thongs or speedos on board, but many on the beaches. carnival has their topless deck, maybe that attire would be more appropriate there?
As a woman who is about 30 lbs overweight-I know I look at the other ladies that are cute in their nice tasteful suits & think "I wish I could look that cute" or "sexy" or whatever...but I am envious of them, however, if they are wearing a thong, I am too embarassed to look, let along think their swimwear is nice. Does that sound weird?