I was under the impression calf is thinner and drapes showing wrinkles more. I've been looking at the collared moto myself and noticed the lamb doesn't hang as limply as the calf appears to.
Or am I wrong? I'm looking for a leather than doesn't wrinkle when hanging loosely.
I think this is wrong in every way it can be. Calf is not thinner, it's less pliable, it's water proof, it's got a sheen and it's heavy. Like, if too close a cut, uncomfortable to wear while driving a car because your arms are not straight down at your sides (note, only if sized too small). Calf doesn't really drape and doesn't really hug your body, in a good way. It holds its shape and won't drape into contours, like wearing lamb over a layered cardigan or something similar would.
Lamb is thin, doesn't have a lot of texture but then gets really grainy and wrinkly with age. Stacks on sleeves resemble raw denim stacks. It apparently soaks water, so don't wear it in rain trying to keep dry. With calf you can just shake it dry and it works for light rain perfectly.