"Wonder Body" is a female body replacer for Fallout 4. It replaces the underwear body meshes for all human females in the game with new (nude) bodies. The mod was created to be as realistic, anatomically correct and lore-friendly as possible. 
It also greatly improves all clothing/armor, adapting them to the new shape, while keeping the detail/folds, fixing numerous problems/bugs along the way.
http://www.nexusmods.com/fallout4/mods/19516/?