While squeeze may be an issue...the primary reason for wearing undergarments is to stay warm. I thought I had a leak in my suit at the knee...so i suited up, with nothing but trousers on...went wading in the shallows in about 55 degree water and froze my arse off...i was dry, no leaks, but i was cold...u feel the cold water against the suit right away.
I've never heard of wearing undergarments just to help with squeeze.
I've never heard of wearing undergarments just to help with squeeze.