As long as it’s cold outside and you don’t pair them with Aviators – which is as grave an over-egging of the thematic pudding as wearing chukka boots with a polo shirt – there are no disadvantages to wearing it. As well as being entrenched in popular culture, it’s a material that offers the warmth of a puffer coat with the suave, virile authority of a trench. We’re talking, of course, about shearling: a material which invariably qualifies collars and lapels for the adjectival use of the phrase “fuck off”, and makes for linings as warm, as tactile, as any material on the planet.
The technical difference between sheepskin and shearling depends on who you ask – some hold that it can only be the latter if the sheep from which it has been sourced was recently shorn, while others insist it depends on the age of the animal. What we can be sure of, though, is that man’s relationship with ovine pelts goes back a long, long way.
Military aviators weren’t the first to realise the element-cheating properties of sheepskin – that would be Stone Age types who relished its soft snugness just as we modern homo sapiens do. As long ago as the Iron Age, the quality of sheepskin was a signifier of social status, while the post-Medieval Little Ice Age saw denizens of Northern Europe reach for their skinning knives, sparking a renaissance which would be further boosted in Britain by Tudor-era men (at least, those with the means to splatter them with venison fat of an evening) opting for fur-lined front-opening over-gowns.
But it was a few centuries later, when American and European pilots took to the skies in shearling-lined bomber jackets, that the rakish potential of this unique material really found fruition. The Irvin Sheepskin Flying Jackets favoured by the RAF during the Battle of Britain and throughout most of WWII was invented by Leslie Irvin - also the inventor of the parachute rip-cord system, since you didn’t ask – in response to aviation advancements meaning pilots could reach sub-zero altitudes but in aircraft still made of un-insulated aluminium – while the now iconic B-3 jackets became standard military issued amongst US pilots in 1934.