I've had a delightfull corespondence with Bill @ Hilltrek in Scotland.
They can make the ventile poncho in any length, and width for that matter.
I imagine it's a matter of cost, the list price will be @ $180 to the USA with shipping.
That may cause pause, but this is the stuff that kept RAF pilots alive in the english channel and lasts forever.
I'm having a custom pocket made for a bottle of laphraiog in mine- assuming I get a rebate this year :O(
Cant argue with cotton ventile, I still have an SAS smock that I bought in a fit of warry-ness about 15 years ago.Its been all over the world and into many strange environments and held up to all the rigours thrown at it. Its a bit distressed now and I keep it for old times sake now.