Nice find... Apparently yesterday was a good day for thrift store Harris Tweed! My wife came home with a Harris Tweed blazer for me which she found at Salvation Army. it's a little bit big on me, but to my mind that may make it a very good candidate for conversion. The pocket placement is already fairly high and I'm thinking the extra length at the bottom might yield enough material for argyle-style cuffs.

Thrift stores are addictive and almost always worth ducking into if you have a few bucks and a few minutes. In our neck of the woods most of them rotate days where items with a tag of a particular color are 50% off. So if fate smiles upon you, you can walk out with a pristine wool suit for $10 or a Harris Tweed blazer for $5. I seem to recall another thread here where someone actually found a perfectly-fitting argyle jacket at a thrift shop!