You can see here, buttons are two tone contrast.The contrast buttons look like what were used to me in some screenshots, but I'm not sure--it's why I ask if someone like Mechanismo might have that info, since I don't definitively. I've found this one photo, which offers a blurry look at one of the buttons, but otherwise I'm sort of assuming the contrast ones are it without more to go off of.
What's the coat lining like? More photos of it on a real person in all the variations would be best--collar rolled down, collar propped up, buttoned up, but in general this looks really sharp. Massively impressed.
I used satin/ polyester lining, but prefer cotton lining on body and satin in sleeves.