Yes, you can buy this stuff from specialist upholsterers Matt.
If you have a look at Red Robin's seats in the Recaro CS thread you'll see how he trimmed his Recaros in this cloth. There are others on mk5golfgti.co.uk/forum that have bought this style of cloth and used it for interior modifications (such as geastick gators
). The only version of this cloth I've seen for sale though so far is the mk5 tartan, which is very slightly different to the mk6 cloth.