I can tell you what I took in our hospital bags if helpful:
Me:
Slippers
Nighties x2
Nightie for Labour
Thin dressing gown
Change of normal clothes - I ended up going back in what I was wearing when I went in
Extra pillow in a non blue/white cover - so as not to confuse it with the hospital ones
Hair bands
Hair brush
Wash bag with travel size shampoo, conditioner, shower gel, face wash, toothbrush, toothpaste etc
Flip flops for the shower
Travel hair drier (not all hospitals would allow you to use one though)
Towel for me - not needed, the hospital had lots
Mesh knickers - not needed, the hospital had lots
Phone charger
iPad
Headphones
Ear plugs
Eye mask
Hand sanitiser
Tissues
Lots and lots of maternity pads - though the hospital had lots
Breast pads
Breastfeeding bras
Lots of snacks: Haribo, dried fruit, crackers, baby bell cheese, fruit juice
I wish I also had a breastfeeding cushion but frankly we already had so much stuff!
Straw and sports cap water bottle - never used the straw
For my husband:
Slippers
Pyjamas
Change of clothes
Wash bag with toothbrush, toothpaste, shaving stuff, shower gel
Phone charger
iPad
He was allowed to stay overnight though so it might be different now
For the baby - we took her stuff in her changing bag
Three baby grows - we were in hospital 5 days so my husband had to go back for more - twice
Three vests - as above
Blanket - we did need it for her medical examination, but I think the hospital did provide one; they also provided disposable changing mats, which we would have needed otherwise
Two hats
Cotton wool pads - the hospital had lots
Nappies - we had a pack but husband went to get more
Muslins
Cardigan
A nice baby grow for coming home - in the end the baby grow she first wore when born was the more special to us, and this baby will wear it too, all going well
She was a winter baby so she also had a woolly hat, gloves, pramsuit - no need to worry about those
We didn’t have a car then, so she went home in her pram in a black cab- otherwise, car seat
I think that’s it!