I love those old minis. I've got a few of them on my painting shelf too. I would say use a different color for the different clothing material, the red shirts and blue pants are good, but the quilted fabric could be yellow or something.
Instead of doing a base coat for the yellow, try it with washes: Base layer=yellow, orange wash, red or muddy orange wash, then badab in the clevises. Something like that.
Keep it up, I'll be wathcing