you can translate it in "bare color" 裸means close to skin, so it can also say "skin color" I think you can use it both :D

"Nude/ bare color" nood kuhl-er bair kuhl-er it's like skin color

in the point of my opinion, it is better to be translated into erotic colours,

裸色中文是啥意思啊，怎么从来没听说过？