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1.
Popular style of women's clothing where a large piece of fabric drapes over or just below a woman's chest. The result looks very similar to something you'd find a pregnant woman wearing because of its formless draping nature, though women who wear this style usually aren't pregnant. Coined by popular satirist Maddox, and referenced in the videogame GTA IV.
"They're called tit curtains because they look like curtains draped over your tits. You might as well be wearing a burka. It's one giant formless piece of cloth draped around your waist. There's a reason pregnant women wear clothes like this, and it's because it usually looks good on them in lieu of a beekeeper outfit." -Maddox
by J Drake May 20, 2008
 
2.
A shirt that, although intended to hide the cowness of pregnancy or fatness by draping what appears to be a curtain over the tits, is now, for some unknown reason, trendy on sexy females as well.

Coined by Maddox - "R.I.P. my boner"
"There's a reason pregnant women wear tit curtains, and it's because it usually looks good on them in lieu of a beekeeper outfit."

Go wear something that is less likely to turn men gay.
by Urban Dictionary December 25, 2007
 
3.
A shirt style employed by overweight women in which the shirt loosley drapes from the chest downward making the wearer look less rotund but more pregnant. Wearers admit pregnant > fat by default.
Look at that hipster- rockin' the tit curtains.
by onthespot April 30, 2009