I used to race bikes and Spidey and I had the same tailor...

It's not simply a problem faced by Spidey and pals.
If in short-legged skin-suits the quick-fix for a guy is to roll the leg up.
Not so easy for a woman or if in a long-legged skin-suit or "bib-tights" especially as when wearing bib-tights it's usual to wear one or two jerseys over the top). It's extremely inconvenient having to almost completely strip just to pee.
Paul..
The RoadRunner..