When I went to prom (10 years ago, but you can go ahead and listen, because it wasn't typical Early 1990s Fashion) I bought one of those Chinese brocade Cheoung-Sam
tops (red) and wore it with a black, 10-gore flared miniskirt and a pair of black velvet Mary-Janes. The top cost be $22 and the skirt I already had around, and the shoes were I think around $15 (from the same import store where I bought the top).
My hair was really, really long then, so I parted it down the centre all the way, made two braids of it, and wrapped them around my head Heidi-style. My hair stayed up and out of the way through a LOT of dancing.
Good on ya for making your dress, though. I love to sew and make most of my clothes these days. While I can do my own drafting, I definitely appreciate the convenience of commercial patterns, even if I end up changing them around some. I have a great fondness for McCall's and Butterick's teens and Misses lines. The sizing is very accurate and the drafting is top quality. I have never had the slightest bit of trouble putting together any of their products (as opposed to Simplicity, where I find that the proportioning is dreadful and everything comes out about 2.5 sizes bigger than they state!) If you can catch a sale on Vogues, their vintage line has an evening dress that is a little like that one you like. All of the major pattern companies have evening-wear. I've had awesome luck with Butterick's. I've used them for several bridal-parties worth of bride's maids.