Another startling option would be a set of trews in the Taylor or Cameron weathered hunting tartan. The taylor would be rakish, and horrible and simply lovely while the Cameron would be a bit more subdued.
There also was this J. Press jacket up on ebay I could use for inspiration. I like the addition of the mechanics sweater, I would however go with a this reproduction m1911 sweater from WPG. If I was to go the mechanics sweater route I could pair it up with a nice pair of Barbour or Orvis moleskin pants.