sweatershoppe.com has Sterlingwear of Boston, which is the company which used to supply the Navy with its peacoats. My peacoat is made by them and I've had it twenty years.

I think I have seen it in olive green randomly, but the website I've linked is weird and old. Contact the store directly and ask if they have, or can get, one of the coats in olive green.

I also thought I saw a green Schott, but they don't currently have it. I would contact them directly and ask if they could make a peacoat to order in the desired color.