Hi
I would just get some workout shorts the kind with an elastic waistband that are easy to get on and off, some tee shirts, good tennis shoes, socks (I would go with the thick gym socks, men socks are usually better and cheaper). I sleep in old extra large tee shirts so I brought a couple of those. The hospital provided me with slipper socks (they look like socks but they have rubber on the bottom so that you don't slip) and they are great as you need something with good traction so you don't slip. The OT people put elastic shoelaces in my shoes so that I could just slip them on and off instead of having to tie that which was good.
A pair of sweatpants can come in handy for the drive home.
If you have some diet issues let them know ahead of time and bring some things like nuts, dried fruit or anything else you like to nibble.
The place I went to had a washer and dryer so I did not have to bring lots of stuff. If you are close to home, someone can always bring you clean stuff if you need it.
You never can be sure about the temperature so a sweater or sweatshirt can be useful.
Make sure you have copies of your insurance card, phone numbers for your insurance company including the precertifiction phone numbers, numbers for your pharmacy, primary care doctor, home health agency if you have a choice, surgeons number and his emergency number. If you have drug insurance have a copy of that number as well. Make sure to bring a list of all your current meds including dosages. Paper and pencil to keep track of anyone you call about coverage, notes and questions as they come up.
Simon