When I was younger and shorter back in the 90s, my parents would pile their jackets and my jacket on my seat and have me sit on that 'booster seat' when seeing a show. I know it sounds odd but it worked!
Nowadays I think a small travel pillow or even a self-inflating cushion may work. I have a friend who is OCD with being clean all the time that she brings a self-inflating travel cushion with her eveywhere and even uses it at the theater on Broadway (as she once told me, you never know how often they clean the cushioned seats or if someone accidentally peed on there, etc.)
Updated On: 6/6/19 at 11:56 AM