I don't think those are laundry stamping letters and numbers, and they are seen in all sizes. some stenciled, some hand printed. I am of the mind that these liner inscribed numbers and letters were the serial letters and numbers of the aircraft the owner of the jacket was assigned to, and was a crew member of.....or, they were id letters and numbers assigned to individuals upon entering the aaf.
Fantastic! Thanks very much. Is there a common height for these stamps? 1/4” maybe? Actually, I just read that the stencils are 1/2”, but the ones in the photo I attached look smaller. Good enough.