I think for your idea, you need a blue underdye base (like a brighter blue, not navy I guess, depending on the top finish that will erode away) with some sort of black finish on top, I don't know exactly how it's done all the ways but it's either chromed, struck through with dye, or painted on top essentially. The latter always looks cheap.
It's not impossible, but the conventional problem is, the huge vats used for coloring leathers require you process metric tons of leather in one color, so you'd need to make like 500 more jackets in exactly the same leather if you are ever gonna get one.
I have ideas about getting around that but I don't really have access to a base layer leather I'd want to use for something like that, so it wouldn't work. I am gonna go all over Japan starting next month looking for new materials though.