Underwear is worn by the character if no other item of clothing or armor is equipped. In Fallout 3 and Fallout: New Vegas, it appears to be a two piece garment composed of unisex boxers and tank top.
In Fallout 4, it consists of a pair of white briefs for males, and a white bra and pantie set for females.
- Take off your armor and clothes in any of the games. Welded on!
Concept art by Adam Adamowicz