I would go with a custom color that would be closest to WWII "officer's pinks".
It's a tan khaki with a pinkish under-hue. Think Indiana Jones' pants in ROTLA.
Best way to do it, if using tamiya acrylics, would be a base coat of tan, followed by a light mist of clear red and over-coated with another light mist of the base tan.
I'd have at least two base colors, tan and a darkened version of the tan, to create tonal variation of the undercoat. Then once you're done, thin the darkened version and use it as a wash to add depth to the folds.
-Fred