You will be wearing a hospital gown and given non-slip socks, so all you really need is to wear something to the hospital that is comfy with a stretchy or loose waist you can wear home, and bring clean undies and socks. Also bring a toothbrush, travel toothpaste, hair brush, deodorant, chapstick, and lotion.
Don't bring meds or fluids as they will need to administer those to you and record them in your chart. But check on this because if you are taking something unusual, they may want you to bring it. In my case, they just gave me my daily thyroid medication from the hospital pharmacy.
Bring your phone and charger and a book, maybe headphones if you'd rather listen to music.
Hospitals are kinda gross, so the less you bring, the better. I had an incident where my IV came unattached and I ended up with watered down blood everywhere, which would have ruined any pillows or blankets from home.
Oh, I brought a small pillow for the car ride home that is made for abdominal surgery (search Amazon for hysterectomy pillows) and can velcro to your seatbelt for extra comfort for your incisions. It was nice but not 100% necessary. For home, I had a weighted heating pad that I loved for sleeping. You will also want a bottle of liquid adult strength Tylenol at home for pain.