I understand that it's pretty cold in space, so I bet they wear long underwear! I asked your question about what an astronaut wears to my friend, Ron. He said: Under the orange launch and entry suits we wear a pair of long johns. Since you are likely to be in the suit for several hours and since you can't open it up in any way to "go," we also wear a diaper for adults! As soon as we reach orbit we remove the suits and put on regular clothes for the duration of the mission (no diapers!). The suits are put back on just before deorbit. The EVA suits are the same with an added cooling garment that goes on over the long johns. It is like another pair of long johns with small plastic tubing woven all through it. Chilled water is circulated through it to get rid of body heat and solar heat

study well