Thanks Theuns.
I airbrushed a base coat of Tamiya acrylic flat white with a bit of deck tan in it, to make it off white.
Next step is to apply a very thin wash of raw umber oil paint, tinted with a drop of Humbrol flat black. This goes into all the folds, seams and crevices. I find it best to keep it very thing and apply multiple times, so that you can control the darkness and apparent depth.
I use a white ceramic tile as a pallette. I det up seven drops of Humbrol 34 Matt White. I tinted 6 of them with a tiny bit of raw umber oil paint and Humbrol matt black in varying shades from darkest to light. Added some thinner to make it quite thin, except I like the darkest shade to be a little thicker, but still thinned a little.
I start painting with the darkest shade, into the depths of the folds, armpits etc. Then I work from next darkest, blending the edges of the darkest bits I've already painted. Next are the mid shades, where there isnt much tonal variation, then the lighter colours on the top of the folds and other prominent light catching areas. I use the pure white very very sparingly, and thinned a lit, just to the brightest points.
I like to paint the different garments in seperate sessions, just to get some variation between them.
It sounds more complicated to write than it actually is.
Cheers
Tony