How can I get that classy updo prom or formal hairstyle? First you need medium to long length hair. You will also need some ponytail holders, gel, and long pins. Don't rely on too much hair gel as this just makes your hair stiff. You want your curls to be loose. First, pull your hair up, use some baby powder to add fullness and then tease your hair. You have to slick back your hair with gel. Part it on the side and pull the hair down. You may need the help of a hair rat. It will help you pull your hair down if you have real smooth hair. You will still need lots of long pins.
Starting with just straight hair, you can use large curlers to get those nice big curls. Be sure to use plenty of pins, flexible hairspray, not the max hold kind, and gel if you need it.
Experimentation before prom will be the key. Use what works best for your hair.