I get it on the two piece - But more in favor of the 1 piece singlet, Kit is correct we will have plumbers butt and the belly boy advertisers chomping at the bit for ad space. Officials will be wasting time saying tuck in your shirt pull up your pants and wrestlers will be using it for a rest period - just like jacking with knee pads and head gear. When going out of bounds hustle back to the center and fix your gear so you are ready to go or get penalized or warned for stalling.
That is in the rules I think.