I imagine a lot also depends on climate... I remember back in Ireland years ago going out pillion on my dad's bike, and being shocked how much colder it felt at fifty mph, on a day when it was just about a little too warm for my leather. Interesting, though, how the rise of mc denim in recent years has also seen other alternatives to leather that still have a fairly classic look come up. Always wondered how perforated leather would perform in a slide - i.e. does it compromise the abrasion resistance any being perforated? Not that I want to find that out first-hand!
The technology these days is good ... the jacket and my armored shirt are my best additions for riding IMO. This armored shirt/jacket is phenomenal. Flexible micro lock armor, fits kinda like a wetsuit to keep the armor in place, and has Class AA abrasion resistance. Highly perforated and almost feels like t-shirt in hot weather.
FREE UK SHIPPING - Designed to be worn on its own in hot weather with No Jacket Required, the Urbane Pro Mk2 is the ultimate lightweight, breathable, impact and abrasion resistant motorcycle armoured shirt. CE approved as a standalone “Class AA” garment with approved abrasion resistance built...
You wear this underneath anything and you can turn any shirt or jacket into "armored".