For the rest of the uniform, I use Khaki for the greenish spots and Flat Brown for the brown stripes. Khaki isn't perfect but it is a good compromise. I originally tried Brown Green and Green Grey, but those colors were way off.
Here, to give you a good comparison, I put some paints onto one of my old jackets. Keep in mind, this jacket is faded from use and the colors are altered by sunlight and infrequent hand washing.