[Tamar1973]

These days guys rent tuxedos and sometimes limos, plus many check into a hotel for the night, also. And the girls really go all out on the dresses, shoes and accessories. There's probably more.

Yes, there's more, including the professional photos taken at the prom to have a permanent record of that $1000 dress, shoes and purse ensemble.

[Will88]

Yep, I forgot the professional photos, and someone else pointed out that prom night now includes a fancy, pre-prom meal for many.