pales, what caused you to have your son @ 36 weeks? I've never heard of that where they say that you'll give birth round about the same time as your 1st, except if you have a selective c-section
mosaneo, things I have on my list that wasn't on Clueless's one is :
Earbuds, Dummy & dummy container (which I don't like), socks, telament drops & saline amps
Clueless, the vests that fastens underneath are very comfortable & I didn't find it to bunch up but you can take only one with you to hospital & the rest normal ones & see how you find them. Hubby can always bring more with if you prefer the onesies

I agree with pales that newborn clothes don't last long but you will roughly know baby's weight towards the end & newborn vests etc will be fine for in-hospital stay. Don't take too much clothes with. 5 sets of clothing will be more than enough. The vests can definitely be newborn & hubby can bring the outfit for going home the night before. Most babies length are 50 cm's so your newborn baby grows will be fine but you can take 1 or 2 0-3 months & see.