Also, N. Bately

http://www.tartan-fabric.co.uk/

Will weave custom order of Polyester Viscose. However, I've seen their stuff, as have several of the kiltmakers on the board, and it's OK for home furnishings, school clothes and so on, but it's awfully light for kilts. Also, the selvedge is no way at all appropirate for kilts, so youll have to hem your kilt or fringe it.

They may weave a heavier weight of PV on special order, though. You'll have to ask. Be aware that they're not the greatest at communication via e-mail. However, their prices are pretty good.