Spads - Shoulder pads? I'm guessing.
Good guess and sorry for being vague. Tailor Maid adds spads, shoulder pads from different vanilla sets, but also other items like it, ammo belts, gauntlets etc., making for lots of possible variations for armor sets.
But if you want a combo, you'd have to make several lists that are made up of the combos, then make a leveled list of the combo lists, then add that list to the vanilla list. Look at the 'WithAmmo...' lists. Those are combos of weapons and ammo together. You'd do something similar with your armor and spads.
Yes, that sounds best. Basically setting up a bunch of combos manually.
I wonder about leveled lists in general. With Oblivion you can use the Bashed Patch that comes with Wrye Bash to make lots of altered and added lists play nicely together. Won't my changes to the Raider lists override changes made by mods that load earlier - and be overridden by ones loading after it? :unsure: