To check the wrist-size and strap-size try this from one of the forum strapmakers (printable wrist measurer..scroll down): http://migliorestraps.com/Order.html
Great link! I'm going to print this and try it out.
UPDATE: I'm on the last line. 23 centimeters = 9 inches. Phew. Doesn't look like Migliore makes straps that big... Still looking at the daily wear thread for inspiration!