One-size-fits-all Tube Dress/Coverup - Black Floral Print

I had ordered this dress so I could use it as a beach cover-up. Received it yesterday and was pleasantly surprised at how nice the fabric was and how flattering the fit. So now I plan to wear it to the block party before the beach vacation. Very pleased with the purchase indeed!
I'm 5'4", 170 lbs, an F-cup, and I'm long-waisted (and usually wear a size 12). I looked pregnant in this otherwise pretty dress, so I don't see myself wearing it outside of the house, unfortunately. It's not very flattering if you're top-heavy with short legs! The fabric also doesn't drape nicely or 'skim your curves'. I regret the purchase.