PNB - Petite Nude Body (v1.2)  

I read somewhere that you have to put either makeup or PNB in the Paks folder - then it works. Try it, it might help.

I think we actually need to ask make-up Modders to allow their mods to work with PNB, as I'm pretty sure it uses assets quite different to Base game.

Which imo, is why Make-up Mods as well as Face Change Remakes tend to conflict with PNB. I already put a request to Ivy, ---- maybe the more of us who humbly request make-up compatible with PNB. The Modders, may release new version.

PNB already seems to be gathering momentum more then 6K views way ahead of any other Mod for this game. With PNB skirts also, this can only get better from here. 

Again a Million Thank You to all modders for giving up their time to make these Mods for FREE, very very much appreciated.

The underwear is only on a few Clothing options, so just keep checking vendor in Hogmeads, 2 i know of

are 'Light Nightwear' and 'Secret Solvers nightwear' could be others but havent come across yet.

Just as a check make sure you don't have any other clothing Mods that change Night wear.

Hope that helps.