So I pondered! Lupa's most staunchly pacifistic experience in an overlay was as Lupa the Spartoi, so I'm thinking the "Thief" outfit for him would be based a little bit on that. So simple white kilt-like garment (probably close to Ancient Egyptian shendyt), and then a wrap for the upper body decorated with small Hindu and Buddhist inspired designs. He'd be barefoot and entirely without a weapon of any kind. Also a blindfold, for reasons. I think I will have him keep it because more clothes to keep is a good thing.

(Excellent. He will have much to talk about now that he's back. Including bugging him about clothing designs.)