I wore my jacket backwards a lot last summer–Ray Jardine style. In the mornings, I’m cold and then after 10 minutes of hiking I’m ready to take my jacket off. By wearing my jacket backwards, I could slip it off without stopping. I then would just hold it in my hands or loop it through my hip belt and carry it that way. If it got cold again I could slip it back on with out having to stop.
It’s a good idea Ray Jardine had, because your front stays warm and your back doesn’t get all sweaty.