@afraser I'm sure you looked gorgeous with little pink ears!
I hit Kmart and got a soft short-sleeved PJ top that buttoned right up the front - easy to get on and off and to open for examination + 3/4 loose PJ pants. I would also suggest taking a shawl or something (large scarf, light throw) that you can drape around your shoulders if the aircon is up too high. Depending on your hospital, it may also be worth taking some thongs or slip on shoes. The hospital I was in had a garden and my surgeon was right on board with me walking outside rather than walking up and down the corridors all the time.
