Here's a jacket as picked up straight from the owner. The owner served in WW1, was a pilot and joined the RAFVR when WW2 started.
WW1 ribbons are sewn directly to the jacket. And a rather sloppy job too.
Unfortunately, I was a kid when I was given this and lost the name of the owner! :/
Note the different colour of rank stripes, suggesting a promotion to Flight Lieutenant.