With DS, I was really glad I brought my own pillow- hospital ones aren't comfortable. If OH plans to stay, bring him a pillow and blanket, too. My hospital didn't provide anything for DH. I was also grateful I had my nursing pillow- made things so much easier! I brought (and will again) my own nightgown- the material was softer and so much more comfortable. But a nightgown as opposed to a top and bottom as even after birth there is a lot going on down there and the nurses/you need easy access (especially after a csection). I also brought a robe and slippers for walking the halls (usually required here before discharge). A couple pair of comfy socks are nice, too, because hospitals are often cold and the socks they had were awful. Don't forget your camera and extra batteries or the battery charger! A lot of people have really dry lips during/after labor, so something for your lips is good, too. Bring stuff to make yourself presentable- whatever that means to you. You don't need to go all glam, but you will be taking a lot of pics and its amazing what a little hair combing and color to your face can do to make you feel better about yourself when you see the pics! I was glad I had my makeup so I didn't look awful for all the pics and all the people who came to visit in the following days.
I ended up with an emergency csection, so I was grateful to have loose pants to wear home or it would have hurt the incision.
Advice my DH was given (though we didn't need it due to the csection) was to have him wear old shoes as if he is in for the birth the floor gets covered in grossness and he doesn't want that on good shoes.
I also think something to do is nice- it can take a while to actually get things going and that time can be a bit boring. Or there may be a lot of downtime while the baby is sleeping. We had some cards, a magazine and a book for me, but whatever works for you- just nothing you have to concentrate real hard on.
Just some suggestions. Hope it helps.