Head to the REPCONN rocket factory where the mission "Come Fly With Me" takes place. Go to the basement where Chris goes just before launching the rocket and asking for spare parts. In this room to the left side as you enter is a shelf with an orange suit and a helmet that resembles a fish bowl. Pick them up. When you wear them they look like something out of a 1960's comic book. It gives a good amount of RAD resistance, but has a low DT and breaks easily.