I had a B2 style jacket (slightly longer than an Irvin) made for me by Cirrus back in 2007 or so. They specifically asked me if it was for motoring use and advised me to have a jacket with ½" pile rather than the full 1" of a traditional Irvin. I took their advice and have been jolly glad I did. I also had it done in 'distressed' sheepskin, as otherwise you have to wear the things constantly for years before they acquire a 'lived in' look. Cirrus, sadly, is no more but Aviation Leathercraft are still going strong and will make you something to suit requirements.

I have practically no pictures of it (never been one for selfies), but this is what it looked like back in 2011 when we did LeJog.

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Tim H.
1986 4/4 VVTi Sport, 2002 LR Defender, 2022 Mini Cooper SE