I love sweater dresses as a whole.
My favorite dress of my wife's is one. You would have to know us, but we banter back and forth a lot and often make these silly bets. Well, we were at the local mall and eating at the food court and beside us was a small woman's boutique. Way up high they had this sweater and so it began. I said it was a sweaterdress, and the wife said it was way too short to be a dress and was just a long sweater.
So after eating we asked the clerk and sure enough I was right, it was a sweaterdress. A good clerk, her next words were, "would you like to buy it?" Sure enough, one in her size went home with us.
I actually see it in several pictures now. We buy and sell a lot of property and on one such purchase, we are pictured with her wearing it. She likes it because she can tame its truncated hemline with leggings for a demure look, or go sassy and leave it short pairing it with pantyhose/tights.