I am 5'7 with, ahem, good legs - anyone can have good legs in black opaques - I bought the plain cobalt blue dress with slash neck and satin hem and cuffs, from one of the first shows, and receive compliments every time I wear it. I have just purchased another 3, and they are all differing in longer lengths - so its trial and error really.
I am 61 with not good arms so I like the sleeves, and the style and prints can be very flattering - especially the ones with the slash neckline. They also wash and wear very well. Ok the material aint brilliant, but all the American designers seem to favour this fabric; George Simonton, Susan Graver, Leonard whatisname - so unless QVC