When my husband and I lived in west Philadelphia, the female students at UPenn came up with an amazing array of slutty costumes. The had the standard set of bunnies, kitties, nurses and devils, but some of them obviously made their own costumes by expanding into slutty executives, slutty raggedy ann (creepy), and one that I can only assume was a slutty hobo.
When I was in grad school my wife, who was working in a vegetable cannery, went as a slutty can. Cardboard formed into a circle and hung from her shoulders. We drew the label on it, and she wore a tube top and shorts underneath. It made her look naked underneath, and nearly every guy at the party could be seen trying to peek. 
Something is wrong here. I work in a hospital and I’ve never seen any of those nurses.
Slave Leia. It’s tasteful, dignified, and will get your friend her pick of any number of men who have no idea how to please her.
That last part is better if you say it in the Triumph voice.
Whyever not? Don’t you shop at AS&S? American Scientific and Surplus?
Of course most female costumes are going to be of the slutty variety. Do you think these businesses operate by only selling costumes to the public on Halloween?
They work at the special clinic where we sent those with the super extra deluxe insurance coverage. Only the CEO and the VPs get it 
And like others have said, there ARE nonslutty costumes, you need to look for them (and you may want to go to theatre-specialized costume shops, if you have them nearby).
Of course, the Geek contingent can show up in full Klingon/stormtrooper mufti but then again they do that every week and, yes, many of the girls show up as Slave Leia anyway. As orcenio points out, that is another factor: outside H’ween, there is quite a bit of market for roleplay outfits that IS specifically aimed at sexual allure.
Y’know, my hypothesis on the sluttification of H’ween is as follows: In other cultures, the holiday where adults act out w/o fear of consequences is Carnival (in February). ** But then again, the perception is that there you have an implicit expectation that you will REALLY let it all hang out (ref.: New Orleans Mardi Gras; Rio Carnival); in American culture, you want to pretend to let it all hang out w/o fear of someone expecting you to, um, cash the check. So the grownups hijack Halloween, which having for a while been about playfully laughing off things that you’d normally be afraid of (death, monsters, witchcraft), had already morphed into generalized play-acting for the kids, and now is for play-acting by everyone.
For some reason, a large part of the female market-segment seems to have bought into the idea that if you’re getting license to play-act w/o consequences, then rather than play-act violence or far-fetched fantastic aspirations, you play-act at overt sexual expression. No, I don’t get it, but whatever works for you…
It’s hard to go wrong with tits hanging out. Ugly tits – trick. Nice tits – treat. Either way, it works for Halloween.
The group with whom I telemark has theme costume nights throughout the winter. Since the temperature is well below freezing, and since skiing at speed results in a significant wind chill, dressing skimpily is not in the cards.
Except for one year when some of the skiers wore bathing suits for the beach party night. All was well, until one of them fell. Skiing and skin do not mix.
Certainly not at Nick’s Costumes
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First became aware of the transmogrification of Halloween into “Dress Like A Slut Day” in the film Mean Girls:
Well, Halloween in the time of year to dress up as something that you’re not, eh?
It isn’t Halloween.
It is Whore-o-Ween.
In total protest to the Slut-A-Thon boob baring whorific costumes for women (Because I have no issues with boobies hanging out, its the rest of the package that needs to be contained), without equal man-slut outfits* out there for us ladies to ogle, I am going as Where’s Waldo.
Shirt cost: $3.40 at Salvation Army
Hat: knit it myself.
Boob Exposure will be at Zero.
*Man-slut is a redundancy.
My yearly pimping for REAL costumes, from your local National Costumers Association affiliated store! If you go to www.costumers.org, you can do a state search for rental and retail shops. Much of the retail will be the same you see everywhere else, but the rentals will probably be much better. They’re generally hand made and fairly accurate as well.
Well, if all the girls are going to dress like sluts, I guess somebody has to dress as a pimp.
cut 2 eyes in a sheet
sorry, I’m totally on the side of the slutty costumes. Pure self-interest, of course.
I love the slutty costumes as well.
I’m a somewhat vain guy, and wish I could dress to show a little skin without looking, well…vain. Instead, I’m gonna be the Swedish Chef. bork bork bork!
You could be…SEXY SWEDISH CHEF? Bork…thrust…bork…thrust!
Ron Simmons is pretty easy.
Incidentally, I disapprove of this thread.