Believe it or not, I don't think there are any!
I've been absolutely absorbed into 15mm sci fi past couple of years and I'll be honest I can't think of a single range that have Great coated dudes.
The Pig Iron Kolony soldiers are pretty unique I think in that regards.
A few troops with gas masks like Rebel minis Titan marines and Eureka sci fi Germans.
Maybe give Khurasan a poke and ask if he has any on the way