Yes. Women's briefs. These are real, and trademarked to Fremantle themselves.
My sister got me these as a present, and I was like, "omg best Halloween present ever". Earlier this month our very own Bobbin discovered them on Topshop's online site and you can view the thread on our forums here. Sad to say though, these are strictly for the summer as right now it's too bloody cold to go around in something like that!
But yes, these are available only from Topshop and sell for £4.00 [€6.00 in Ireland] but grab 'em quick, I don't know if they will last that long!