Hi China, I'm glad mum and little one is doing well.
I didn't have a c-section but had to spend four days in hospital after the birth and had a catheter so would definitely suggest a cheap night shirt, and also I didn't get on with disposable pants (think rab C nesbitt string vest in knicker form) but just bought a couple of packs of big knickers a size too big from Primark. I think for less than �20 I got 15 paris of enormous pants and three nightshirts, all of which, I am pleased to say, have now been binned.
Also, my mum bought me a bag of goodies - individual bottles of juice / smoothies, snack bars, bunch of bananas, etc. I didn't eat in the hospital and would nibble on something like that if I fancied it.
Yes, maternity pads can be bought from Boots - on a really picky level I found Tesco to be the best (they at least had some shape and didn't make you feel like you had a pillow in your pants).
And maybe some flavoured waters because with the catheter they wouldn't allow me to go home until I could pee and I got pretty sick of drinking luke warm water all sodding day.
Sorry if there was a little too much info in all of that!