Many thanks everone.
MickeS - you inspired me to make this, I got the grommets from a local sewing & material shop. They can be found on line too though.
phill_ue - as Chris said - Swedish Army wool trousers. I got these from a US fleabay shop called Suzi's Surplus (even came with package contents marked as used pants, the lasses in the office had a field day!)
Klenchblaize - Got the shirt second hand, it's made by Woolrich.
All the best.