While Paris Hilton tried ever so slightly to be a "slutty something" for Halloween, it looks like putting in any effort at all into dressingup wasn't the thing for Lindsay Lohan.
No, it seems Lindsay Lohan was just fine with wearing as skanky a Halloween costume as possible. Thing is, wearing lingerie isn't really a Halloween costume, it's just underwear, and when you can afford ellaborate, expensive costumes, the onus is upon you to try. She didn't even spring for the little cat ears.
Lindsay Lohan isn't into trying. She's into making sure she gets attention whatever way possible. Even if it means being a total slut.
Update: It could just be my imagination, but after reader Ron Z pointed it out, I do think I see some Lindsay Lohan nipple through that rather see-through bra of hers.