I learned that if a woman is showing I should better act as if there was nothing special. Staring at her or commenting what I see will only lead to her covering up.
I used to visit a bar where the young lady selling the drinks mosty wore black leggings with a thong underneath. I was often lucky enough that she had to bend down to get drinks from the fridge. Then I could see her pretty ass and every detail of her thong. Once she told me that at a party some girls told her that her leggings showed too much. I reassured her that I had never seen anything, and could continue to enjoy the sight