Scoliosis corset and long journeys?

Hi!

I wear a relatively long corset that reaches below one shoulder. On car journeys, it becomes very uncomfortable after long periods of time, and it presses on my back and hips. It doesn't matter how I sit, it just presses so hard!

Now I have to drive for 12 hours (if all goes well, and no, I don't have to). I know I can take off my corset, but I'd really hate to do that, since I won't be wearing it on vacation anyway (only at night). It's currently 27°C.

LG