This ^^^^
The colours of the real things varied a lot anyway, even before they were subjected to natural bleaching, fading, dirt etc. in the field.
When it comes to painting, my philosophy is that if it *looks* right to the eye, it's probably there or thereabouts.
A lot of this stuff with companies releasing specific colour sets for such-and-such a garment or metal type or flesh tone or whatever is just marketing IMHO, making the whole painting process appear like some kind of "dark art" full of wonder & mystery and in need of a magical key to unlock it all that only AK, Mig, Scale 75, Vallejo or whoever can provide.
All the companies are at it, often making things a whole lot more complicated than they need to be, and you end up in danger of not being able to see the forest for the trees.
- Steve