I have same bug on one of my shapeshifter characters... it is not annoying me actually.. i actually made this bug part of my character - he never wears off his helm, as well as plate, and being eldritch knight it is quite qool that you look like buffing wearing full plate

I still prefer that there will be fix for this bug but will be option to change underwear... Some shop for it perhaps... I know its possible with modding - i been playing with all those new cool looking female dresses patches for OC and other campaigns , so there u can edit save and change it...
Perhaps temple of Teshalia should handle this buisness
