Congratulations! Exciting time 
I would say the big thing for me with my first was I didn't have enough babygrows with me! I took 4, 3 first size out of one pack (which I think were marked wrong and were definitely tiny baby....he was 6lb 11oz to give you an idea of sizes) and one single which was also first size, also from next but a lot bigger. 4 x vests, a cardigan, some hats and mits. I had him at 4.50pm but had had an epidural so it was 8pm before I was moved to the ward. He managed to stay in the first babygrow all this time. When I was put on the ward my DP had to leave due to the time, I had 3 babygrows left, my DS vomited that much through the night bringing mucus up and other stuff he had swallowed by the time it was morning and suitable for my DP to come back I had to get him to bring another pack of babygrows in with him! the last one which was the single one was swimming on him and then he vomited on it anyway 
he was just wrapped in a blanket until my DP came to the rescue!
(sorry went on a bit there!!)
I've switched hospitals this time and they have advised 8 babygrows (in a couple of sizes) 8 x vests (again in a couple of sizes), preferably babygrows with mits built in because the loose ones fall off, and a couple of cardigans. A full pack of nappies (newborn/size1) and some cotton wool, they don't like you to use wipes. and a hat! They said they don't bath them anymore but if I wish to do so then I should bring my own baby shampoo etc but anything else other than that is unnecessary. Also check about if you need to bring milk (if you aren't breast feeding) or if the hospital provides it.
For you, check if the hospital provides towels (mine does), shampoo, face wipes, make up (amazing how much better you feel getting freshened up), phone charger, camera, knickers and plenty of them, cheap ones you can bin! plastic bags to put your dirty clothes in, nightie or tshirt to give birth in, socks, proper slippers and a dressing gown, bobbles, deodorant (basically pack as if you are going on a weekend away but don't forget maternity pads and breast pads! even if you aren't planning on breast feeding they may still leak)
sorry long post! if I have missed anything useful im sure someone else will help!