Shampoo and conditioner, soap (Unscented) they may make you have a shower to get cleaned up
Breast pads! For the leakage.
Underwear you're willing to get ruined.
Loose shorts or sweats.
Socks! Hospitals get cold, plus you might go for walks.
Nursing bras unless you're not shy, then no need.
You can bring a go home outfit, but the outfit you came in will work. (unless your water broke in them.)
The baby will need an to go home outfit. I know some hospitals have outfits already, but yours are probably cuter.
Mits for his or her baby hands.
Hat to keep warm