Have to say IMO the Double Helly field jacket is great buy, helly are still making them in small numbers, they're still doing singles too, although only in navy blue. As mentioned above a brief search turns up "penrith survival" with a reasonable stock across the size range there are a few other stockiest too;
http://www.penrithsurvival.com/buy/...-jacket-hard-wearing-pile-field-jacket_67.htm
This is made from one of the earliest types of fiber material, one of several that were on the market way back when this type of thing first came out around 35 or 40 years ago. However the helly hansen fiber weave was different to all the others and has proven to be the hardest wearing, by a long long way. This early stuff was constructed by tucking the individual fiber through a light mesh substrate layer. Helly hansen's process was different in that each fiber was individually tied to the mesh layer, they still do both a single and double version, single means the fiber is present on one side of the mesh layer, the double both sides. The only one I've ever heard of being worn out was the result of a motor bike crash and contact with the road.
The up shot of the double pile weave was that it created a material combination thats seemingly indestructible, the harder you use it, the tougher it gets. It starts off light and supple and gradually the outer layer of weave matts up like dreadlocks retaining good insulation whilst creating an incredibly hard wearing almost protective layer, whilst not stab proof certainly slash proof
Doesn't like flames as with any synthetic but thats about it. A pal of mine still has and wears his double helly field jacket (and salopettes, anyone remember these?) that he bought second hand in 1983. I've been through a couple simply because I sold one in the mid 80's when I ran out of money and I lost another I was using for work when the work van was reepo'ed due to the company going bust in 2000.
I've got two these days, one of early 90's vintage thats been worked and climbed in and another almost brand new at 6 or 7 years old. I'd highly recommend one, it'll last a generation +
