I use to work for a high-end retail store in Denver. While working on the computer systems. I was bent over on the floor behind the counter messing with cables. I had a male coworker walk by and make a comment "Hey nice thong" I just laughed it off and said thanks. Every once in a while he would say hey are you wearing a thong today. I said yep everyday!
Another store I worked for was a men's clothing store. We had to dress up.. shirt, tie and I always wore a vest. My dress pants were always fairly tight. A male coworker and I were horsing around one day he jumped on my back he reach back and slapped me on the ass. It basically sounded like skin on skin. My coworkers first comment after slapping my ass was "are you wearing a thong" I said yeah its all I wear. My underwear choice comes up a lot .. sort of as a joke but still all in fun.
Surprisingly and sadly while working here i never saw a customer in a thong. Trust me I saw LOTS of guys in their underwear. Still though you would think maybe one or two guys in thongs but sadly none.