Fashion Advice?!? (please help!!!)

Noël • Nursing Student • Artist/Photographer • 23 •
Hi ladies I wasn’t really sure where to post this so I decided to post it here. I need a bit of fashion advice from anyone who’d be willing to give it! So the little premise to this is that it’s my boyfriends 21st birthday this May and we are planning a big night in NYC, but I literally can not find a dress anywhere! I am looking for something specific... since my boyfriend is wearing a dark navy blue suit, I decided that I wanted to wear gold ✨ I never get dressed up so I really wanted to have something sexy yet sophisticated. I really wanna knock his socks off lol! I have been to every store online to try to find something and I’m still coming up short! 
Attached are some pictures of what I want to try to mimic (preferably short)! Please any help is greatly appreciated!