I am always looking to add to my small collection of cocktail dresses ...
I have a variety of little black dresses (a few in cerulean blue or deep purples, too) - they range from sleeveless, plunging V-necklines to strapless to long-sleeved (more like 3/4 length sleeves) vintage styled dresses of the late 50s to 60s era dress styles.
Here's a classic black cocktail dress that might look nice on me:
More than likely though, I'd probably have to make my own pattern and play with the ruffling on the neckline a bit. I'd change the type of fabric too - I like fabrics that feel stetchy-snuggly on my body. And, instead of the waistline (as shown in the photo), I'd probably make it an empire waistline and drop the neckline a bit, so it was more of a "vee" and adjust the ruffling - maybe use chiffon for the ruffling???