Can't help you with the specific paints to render the colors, but I can offer to provide some color photos for references if you'd like. This is my first post to FSM so I'm not clear how to post the photos online. If you want I could e-mail them to you.
Some suggestions - You may want to consider what year of the war you want to portray. I don't believe uniform color specs changed, but I could be wrong. Issue uniform color varied from supplier to supplier, from year to year. And sun and weather bleaching lightened the color a great deal. The uniform makers were using vegetable based dies, not chemical, so uniforms were not color-fast and the makers couldn't always control color from lot to lot. Anyways probably more than you wanted to know.
All the best,
Dan