The general "rule" in the garment sewing world is to never, ever use quilting cottons for garments as they are too stiffly woven and won't drape properly. For those that fear the "Becky Home-ecky" look, breaking this rule is tantamount to cardinal sin.
There seem to be three types of seamstresses when it comes to this matter.
First, you have your fabric connoisseurs who wouldn't touch a quilting cotton with a ten foot pole. They're devoted to lovely garment fabrics and (let's face it) they're not afraid to criticize anyone who uses quilting cottons for garments.
Then you have your rebels who love to use quilting cottons and aren't afraid to flaunt it. Hey, they're adorable, widely available, and inexpensive. "What's not to like?" these rogue warriors say. (This is often said in a defensive tone, it must be admitted.)
Lastly, you have your voices of reason: the sewists who say that all fabric varies widely and it's largely about the quality of the cotton in question. For these level-headed seamstresses, each fabric must be judged by its own merits, not dismissed as a wholesale group.
Hmm. Or maybe there are four types, the fourth being the sewist who vacillates between these groups depending on which stance conveniently supports her current frame of mind. This fourth type wants to be virtuous, but her morals start to break down in the face of fabulous printed cottons with sugar skulls or birdcages. This would be me.
I've made one garment out of quilting cotton, and I was not struck down by the sewing goddesses. In fact, I rather like it: