Hey Lisa.
You don’t need much for a day case. I didn’t have strapping so don’t know about having to wear a bra but it can always just be safe to take it with you. A dressing gown, slippers, some magazines, hair tied up. Jogging bottoms, front fasten top and a front fasten hoody to leave in.
I had my V pillow in the car and and square pillow to take to the hotel. And any usual toiletries you’d take.
I bought Macom’s signature bras. You only have to know your back size, so the usual size you would wear in a bra. They are really comfy and supportive and front fastening.
Hope this helps. Whens your surgery? x