Well I know it was a big revelation to discover the Check waistcoat was a short nap velvet (or perhaps a velour) and not some kind of tweed/wool. It is more apparant in the patch scarf pictures than any of the wasitcoat shots though. But yes this was confirmed because peices were cut up and used to patch the Shada scarf and about 4 different people have confirmed the fabric content base don this.
For those looking for an available close enough tardis scarves on GB uses this fabric for her Shada scarf patches: fashionfabricsclub.com: There are so many plaids that would work, that it was hard to choose. I bought #ZZ516 Taupe/Beige Coating
Pete if I recall correctly just found a close match form thrift/ebay shopping and didn't do a recreation per se.
As for spoonflower, you can do this with the Check fabric on their heavier twill cotton which will do fine enough for a vest to get you by. I did a few early tests this way for color sampling and it will definately give you the read you want and it's the most convenient/cheap way to have this done. Though with the current info now known, accuracy buffs will now insist for a dull cotton velvet version and that gets a bit tricky for printing hence the group run I wanted to organize and why some won't want to bother with the soonflower route. For the sake of getting something out there I would post this to spoonflower myself for the time being but it's not my graphic work - I'm waiting on permission before making it publicly available beyond the pre-agreed group run we discussed when commencing the project.