Yes, Virginia; this costume is real:
http://www.spirithalloween.com/prod.....ies-thong-set/
Be afraid, be very afraid.

For those of you who don't know, the Spirit Halloween store is a specialty store that is usually only open from September to November.
Early September this year, a friend of mine was on their website. As a joke, I came up behind her and asked, "so, what are the new and exciting ways to dress like a prostitute this year?"
She replied, "Let's find out" and clicked "Women's Costumes"
I swear, I really was joking. 178 pages and maybe 18 costumes that either of us would actually wear; willingly at least. Enough hot firefighters to put the Chrysler building, enough sexy cops to arrest every crime boss in Vegas, enough cammo cuties to make a new SEAL team, the list is endless.
And this; this took the prize for "wtf?!"
Not only is this in no way related to anything remotely Halloween, I'll remind you it was early September, the store had just opened; this costume was Sold Out. It still is.

Why To Aru Kagaku No Railgun? Because it was too funny... and a little too plausible. Anyone who actually knows who these two are knows what I'm talking about.

Have a Spooky Halloween, everyone!