Below, I will show you two of the ways I usually wear it.
Over a long off-white sleevless t-shirt, with grey skintights from La Redoute and flat casual boots.
I also wear it over a gray satin dress (sava). I buckle it up till the waste and let it loose so the dress' detail will be obvious. My favorite detail is the strapless blouse that I put over the white shimmy. I wear it with flat casual boots in the day or high-heeled boots for a night out.
So that was my black and white and gray suggestion of the day. You see that there are so many ways to wear a long "Mozart" shimmy.