To keep from falling into the unrecoverable abyss of Fred-dom, why don't you just layer? Maybe go with a wool undershirt (unless you're itchy, in which case use a Craft or whatever brand undie that wicks), then a wool/wool blend jersey w/ or w/o long sleeves, and if you go short sleeves you can go with arm warmers, and knee warmers, and possibly a light jacket or windbreaker, like the PI ones. When it all gets too hot, take whatever off, roll it securely into your jacket, and tuck it under your jersey. Yeah, OK, you'll look like a freakazoid hunchback, but what would you rather be, a hunchback or a Fred?