SOS - NPCs with underpanties, but everything else works

[HurryStorm]

Hello guys, so my beautiful Nord finally gets some fun he deserves, between having to behead a litchking or absorbing a dragon soul, who wouldn't seek refuge from the stress into a nice bear? 
Everything work fine, after a long LONG list of tryouts to get everything to work with Vortex, Loot and the other diabolical instruments needed. 
I have just one problem that still needs fixing and I am worried that if I touch something now that even the M2M animations works, it may ruin everything. 

The problem is: my character has its schlong perfectly working, but the npcs don't. They always have that ugly brown slippers that I would like to set on fire. 

I know this question has probably been asked a few trillions of time but doing a quick search it was always related also to the missing panties of the character. 
Is there a solution? Is there a command to tell the npc to remove the panties? 

Thank you for helping a fellow dovahkiin out!

[flutie]

Permaundewear (the underwear does not come off)
Symptoms: There is a brown underwear instead of a schlong while nude
Causes and / or solutions: The underwear shows up becouse SOS can't put a schlong in your character or NPC. There are a lot of reasons for this
- you have no SOS addon esp installed or enabled, please install at least one schlong addon
- is a custom race for which you do not have a compatible SOS addon installed. In that case you can force a schlong upon the affected character by using the MCM menu "Player / NPC settings" and select a schlong for him.
- the MCM settings for SOS doesn't allow a schlong for this character

 

Permaundewear (the underwear pokes through armor)
Symptoms: There is a brown underwear poking through your armor
Causes and / or solutions: The underwear shows up becouse SOS can't put a schlong in your character or NPC and SOS has not modified the armor to add it the pelvis slot (52).
This may happen on custom races with custom armors, depending how the race is done. If not, this is most likely an error in SOS scripts.

 

taken straight form sos mod page under list of popular troubles