Yeah I go commando, but no I don't worry about it. My shorts usually go far enough down to cover my knees, and either way, I frankly don't care who sees what. I mean in the unlikely event it's showing, it's no big deal to me, and if someone has issue with seeing it, either stop looking, or tell me it's showing before kindly asking for me to reposition things, and I will.
No, but sometimes I do wear sheer to waist pantyhose which are really comfortable and my Boyfriend absolutely loves when I wear them. If I don't have on hosiery I wear my normal VS thongs. None of my bits are showing that I know of.