On City Hall or an in-game computer,
NRaas > Dresser > Check Outfits > Accessories > Random Accessories > Female Chance > 0 (default is 75)
NRaas > Dresser > Check Outfits > Accessories > Random Accessories > Male Chance > 0 (default is 75)
Repeat for Makeup > Random Makeup
(and for Hair > Random Body Hair I guess)
To prevent the immediate initial checks and re-rolls the first time a saved game has the mod in play, a tuning file alongside of the mod is required. It's the fourth one on
this page (scroll down a bit) called J4Ks_Dresser_Tuning_V30_Disabled_Initial_Check.zip
I never use the mod myself, but those seem like the correct settings to change. Others at NRaas could offer more guidance if these don't do/prevent exactly what you had intended.