Two Piece Bathing Suits Last Summer I Saw A Woman Wearing Briefs And A Pad Underneath A Two-piece Bathing Suit. Why Would She?

Last summer I saw a woman wearing briefs and a pad underneath a two-piece bathing suit. Why would she? - two piece bathing suits

I swear it's true. A woman in her forties, has a bathroom with two pieces of nylon shorts and a thick cushion. She went with her underwear on the back. I do not understand why they dress that way. Nobody found it strange? Should not that women are more modest than that?