Hello Damian. For both the jacket and pants i used a mix of the following colors. Raw sienna, (golden ochre whould do just fine), Burnt umber, storm blue(which is a very dark blue), black, and napples yellow hue. These are josjonas acrylics. If you play around with those colors you can get a great tonal variety of fieldgrey. Then highlight with napples yellow hue and shadows adding black. Quite easy color.