"thinks about children"
Senna in Tavern Clothes? HNNNG
I read that if you put a set of clothes identical to what your follower is wearing (i.e., Hooded Monk Robes) in a chest along with the outfit you want them to wear, then tell the follower to "take all" from that chest, then trade with them and take both copies of their original outfit, that they'll equip the other set. But I've never tested it out, and I have a feeling it's bullshit. In any case, I think you'd still need the Perfect Touch perk to take their original set to begin with.
Both my choice are from Oblivion. Umbra and Mannimarco. Umbra so I can outright kill her when she least expects it, take her sword and armor, and Mannimarco so I can kill him, take the Necromancer's Amulet and Bloodworm Helm and gain the essence drain spell. the sword Umbra will try and possess me and so will Mannimarco, ultimately turning me into a soul-hungry, necromancy wielding Lich King. XD