If I think correctly, nude and naked are the same word. Hence
nude_ribbon (alt. tag) -> naked_ribbon (existing tag).

This alias doesn't seem to be strictly necessary, since "nude ribbon" is not even being used at all. It has potential to be used in the future, though.

Assuming that jxh and other people would accept aliases like this, here is a list, including the aforementioned "ribbon" one:

• nude apron -> naked apron
• nearly nude apron -> nearly naked apron
• nude bandage -> naked bandage
• nude cape -> naked cape
• nude chocolate -> naked chocolate
• nude coat -> naked coat
• nude hat -> naked hat
• nude helmet -> naked helmet
• nude hoodie -> naked hoodie
• nude overalls -> naked overalls
• nude ribbon -> naked ribbon
• nude scarf -> naked scarf
• nude sheet -> naked sheet
• nude shirt -> naked shirt
• nude suspenders -> naked suspenders
• nude tabard -> naked tabard
• nude towel -> naked towel

EDIT:
Adding more items to the list, by copying them from tag group:nudity.

Did the list.