As promised some time ago:
Here are some pictures of a very, very old - and maybe even one of the first "Irvins" from Aviation Leathercraft. I bought it way back in 1977-78 - direct from Simon Green during a visit in UK. After wearing it for a couple of years, I passed it on to my father. Who took good care of it and gave it plenty of use.
I know that the ALC Irvin is not regarded as the best repro on earth - but there is something about these early ones.