The Anatomy of a Suit is an exhibit now showing at the London Museum and apparently dissects suits, some historical, to show the innards. While they sadly did not appear to proof their material, it would still be an interesting thing to see. Running until June 2014
Also, a reader points out a new source for Agreman gimp, my gimp of choice for hand made buttonholes. This can be bought at WAWAK sewing supplies.
Thanks to David and Nula for pointing these out.