I have already done this in my thread and someone else has also already done it as well. So you have two options for nude reaper undies.
Naduron - is it possible to leave the pink hair the way it is by default and just color the tail separately?
EDIT: I'm playing around with a way to make the devil-wolf tail the same color as the hair. Wish me luck O_O
HELL YES (still need to mod it a little...for some reason they have a white tip).