There's definitely some kind of dreamotion magic at work here. How else would they be able to do this without us feeling a thing, or seeing where they've put our clothes?

[He reaches out to tug at one of the articles of clothing with a thoughtful frown. He doesn't quite try to pull it free of the little mountain it's become a part of, though. It's more about checking for any kind of reaction from somewhere in their environment, his eyes searching the darkened area while he rubs the fabric idly between two fingers.]

I don't sense anything, but our thieves must be here with us somewhere... Are you particularly practiced in any kind of advanced magic? If our clothes are vanishing off of us as part of a spell that's been placed specifically on this area, there should be some way to counter it, right?