Nightgown or shirt to wear during labor if you don't feel comfortable in a gown provided by the hospital (they should be loose fitting or something that can be completely opened in the front)
Robe or bed jacket
Socks
Slippers
Nightgown and/or pajamas (if breastfeeding, then bring ones made for nursing)
2 - 4 bras (nursing bras if you plan to breastfeed)
3 - 6 pairs of underpants
Toiletries (toothbrush/toothpaste, soap, shampoo/conditioner, deodorant, lotion, comb/brush, lip balm/chap stick)
Elastic/Scrunchie or hair clip to pull hair back during labor
A photo or object to be used as a focal point during labor
Going home outfit (something comfortable/loose fitting)
Optional
Lollipops or hard candy to keep your mouth moist during labor
Sanitary pads - the pads the hospital provides you may not be as comfortable as your favorite brand.
An activity (such as pre-addressing birth announcements or crossword puzzles) or a book to keep busy during early labor
Your baby book - you can record your delivery details and first moments with your baby and the nurses can put your baby's hand and foot prints on the appropriate page while they are inked for the hospital records
Cord Blood Collection kit (if you decided to collect your baby's cord blood)
Makeup, lipstick, scented shower gel or body powder to make you feel better after labor
Eyeglasses or contact lenses (keep in mind that you can wear your eyeglasses during labor, but you must take out your contacts)
Watch
Address book
A few small gifts or one for all of the nurses that helped care for you
A small gift for the other children at home from the baby