Hmmm...usually "associated" with clothing...so not necessarily ON the clothing, just associated with it.
After looking at the photo and pondering the clue, I have come up with this definitive answer:
I have NO idea.
At these crazy magnifications, it could be a piece of THREAD for all I know.
uh, is it...a needle? That seems just about as likely as a piece of thread, which is to say, it doesn't seem likely at all. But it's all I got right now.