I can only really tell you what The Professor told me, but...

[ She breathes for a second, trying to remember how it goes, exactly. ]

So there's a weird side-effect to the machine he used to get you all? Basically, it also dragged a bunch of your stuff with you - it's theoretical, since the technology is new, but the term he used was resonance? Like... things that have the same wavelength as you, things you've touched or have an attachment to. Sometimes it's clothes, sometimes it's... your friend there.