Now that I have your attention:

There appears to be a game engine/scripting bug with actors who start dead and initially disabled -- they have their entire inventory removed unintentionally.

I've checked the scripts, and at no point are these bodies stripped, and they have clothing in the Creation Kit.

Examples of this oddity include Kodlak Whitemane, Veezara, and Isabelle Rolaine.

It seems very selective, since the other dead bodies in the Falkreath sanctuary are proprerly attired, for example.

Since the WIDeadBodyCleanUp script strips inventories, perhaps it's going haywire? My best guess.