I might try picking up a coat or suit on e-bay or mail order. Most of my MTM jackets are about 20 1/4 wide, but I specify my custom shirts at 19.5" (seam to seam, across the shoulders), which fits perfectly. Can anybody give some advice on the shoulder width of the jacket as it relates to shoulder width of a shirt? Does arm size have something to do with it, i.e. is it necessary for the jacket shoulder to extend far enough to allow a proper vertical drape over bicep/tricep? Thanks guys.