Tiny mod that makes it easy to customize combinations of restraints, skimpy clothes, wigs, & accessories, into slave outfits. Then you can distribute those varied outfits to NPCs, usually via SPID. This will replace their current outfit, stripping the NPC of their current clothes and giving them something new to wear.   Mods like SES2 will distribute your customized slave outfits to the slaves of Skyrim. Alternatively you can distribute them yourself using a custom SPID file.