This is the prom dress my 15 year old step-daughter got for here first prom. She got it from JCPenney's. I think it was about $100. Here first boyfriend is a junior and he asked her and even though her prom is March 29th, I think a lot of others are in May. You'd still have plenty time to make your prom dress out of some great vintage material and here is the perfect pattern.
Butterick Classics Pattern 6405
Misses’/Misses’ Petite Dress & Stole: Close-fitting, lined, flared dress, above ankle or evening length has shoulder straps, band, princess seams and back zipper. A: contrast shoulder straps and band. D: contrast band. Contrast lined stole.
Suggested Fabrics: Taffeta, Peau de Soie, Crepe and ottoman Faille.
This is an uncut pattern from 1999.