So looking at the nexus page for this mod, I don’t know why you need to add more outfits to it? the description says it has a bodyslide preset for it so if you use it, it’ll shape any outfit you have in game that has a bodyslide option to this preset.
To explain more, it requires Caliente’s Beautiful Bodies Edition -CBBE- which gives every vanilla outfit and armour in skyrim bodyslide shape. Now if you want a custom outfit modelled for skyrim that has bodyslide compatibility then that’s gonna need some time and effort, but otherwise you can find countless outfits on nexus that work with CBBE and bodyslide that’ll work with that preset. just follow the instructions on the nexus page for how to get it to work, and then search for what ever outfit you want on nexus that has bodyslide feature with it and there you go