This Tiffany One-Shoulder Jumpsuit is by Dress the Population, so I know its flattering and comfortable (its a great brand for formal attire!)
When I was a teenager, prom dresses cost $50-$150, but nowadays, they can easily cost $750-$1,000+

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Fame and Partners The Jami Dress Show off in this sexy Fame and Partners The Jami Dress ($209-$299)
The Nest Meadow Long Sleeve Slit Maxi Dress $68 or 4 interest-free payments of $17.00 by More info Product Description Excited to bring you the Meadow Long Sleeve Slit Maxi Dress from our exclusive collection
With Beetlejuice Beetlejuice on all your go-to streaming services, Lydia and Betelgeuse's iconic red wedding looks are sure to turn heads this Halloween