Dresses with asymmetrical necklines are carried mainly in acid colors like orange or fuchsia, too frilly, with drapes, etc.
Here are several models of asymmetrical dresses of different brands:
Asymmetrical dresses 2011
Zara asymmetrical dress
Draping and asymmetrical dresses H & M
Asymmetrical dress with ethnic print Sfera
Asymmetrical dress with ruffle Stradivarius