I have a as new, unworn, cold weather DPM combat smock that I got while I was at RAF Mildenhall a few years ago. The fabric is like the old winter weight BDU or just a bit heaver. The size is 190X120 which the Brits list as a XXL-long but it fits closer to a US XL-Long. I wear a Large-X-long BDU/ACU shirt and a XL-long field jacket if that helps. My shirt size is 17.5x37. I am asking $40.00 OBO and I take Pay Pal. Shipping is actual. I paid around $55.00 USD back before the exchange rate jumped way up.
Here is a description that I found on the net.
"1994 Pattern Combat Jackets were made of a thick cotton blend material and they have an enviable reputation for durability. The material is treated with a water repellency agent so that the garment is shower proof. The jacket features six front pockets, two of these are large zipped pockets and the other four are large button down pockets. The jacket is zip fronted with a nice high zip up collar to keep out the worst weather. The jacket also features a draw cord waist and hem, Velcro adjustable storm cuffs, a small pocket on the arm and an inner lining in the shoulder and upper body area."