This mod hides a large number of unique collectible 't-shirt' type clothing items all over Cyrodiil.
Think of these like the shirts you'd buy from Planet Hollywood or Hard Rock Cafe. They serve no purpose other than being looked for. Some shirts are only accessible near the end of the game, after most quests are finished, but that should be when you're bored and looking for something to do anyway. If this proves popular, I will add a second 'pack' with even more shirts and locations.
I guess if you get really desperate you can open it up in the Construction Set and see where they're hidden, but that kind of defeats the purpose.
Have fun. Good hunting.