Thank You for the Enlightenment and Welcome.
I understand now, in classic car circles they're 'Anoraks' as they are inevitably wearing one usually with dark grease stains caused by non-contact with a washing machine, or soap. Even in summer they will be carrying one

I used to help a restorer who loved to bait them; colour not quite right, wrong trim/body colour combination, you get the idea. The model club I belong to are pretty laid back so I think slipping in "Whiffery" needs to be done. I blame Terry Campion Your Honour.