Here's my advice:
Agree about the pants - I bought large black ones from primark and binned them afterwards
Take your own sanitary towels - the hospital ones are horrid. You COULD use up to a pack a day, so have planty at home for DH to bring in ( unless he is OK about buying them if you run out!!!)
Dont take nice new pink fluffy dressing gown and slippers. You will bleed all over them
Take plenty food and water / juice etc. The hospital stuff is in short supply or appalling
Have someone with you all the time the next day ie from 9am to 9pm or whenever visiting is.If your Dp cant stay all the time get a friend, sister etc. They are very short staffed. All the nurses will do for you is give out the drugs.
They will not have the time or the skills to help you BF. Learn about it yourself first
Be prepared to get no sleep as there are visitors there all day.
Be prepared to have no privacy - you are not allowed to draw the curtains around your bed unless you are BF!
As you can tell I hated it and came home 24 hours after the op. They discharged me with LOADS of great drugs and the food, care and privacy at home were FAB