Yeah, I was going to say. BBC tends to custom build alot of their stuff. They have a great costume department that probably chomps at the bit to do nifty custom jobs like that.
I tuned in to Torchwood for the 1st time ever the other night in my hotel room(only basic cable at home, I'm sadly SciFi and BBC free), and thought this would be a cool costume for someone to do. Can't wait to see someone execute this.
I'm currently away on business, but when I get home later this week I'll check my books for patterns. Most of this kind of period style menswear comes from or is inspired by the patterns in "The Cut of Men's Clothes." The seaming on the back was popular throughout the 18th and 19th centuries and is referred to as a "fiddle back."