My Thong.
Are you wearing a guy thong or a girl thong? I think that will make a difference in a locker room. Either way, I'm sure some guys will look and chuckle but perhaps if they see a girl thong there could be more unwelcome remarks.
I have worn a guy thong a few times and do agree that you can feel that string going up your ass, not always a good
feeling. Some thongs have wider strings and some thinner, you have to find what works best for you. I myself am more comfortable wearing a jock instead of thong.
I like wearing a thong as well. It is the feeling of the strap rubbing my hole that I really like. I have worn it at the gym as i dressed and walked around. Had a few stares, a couple shaking heads and one guy ask me what it felt like. He was wearing a bikini brief at the time.