We EMAGERs (Early Morning Anaerobic Group) also use the "Salvation Army Coat Technique" for cold race starts. We wear $10 winter coats and toss them off to friends just before take off.
If they get misplaced, some less fortunate soul ends up with a warm winter jacket. At the Birkie they end up at the finish in a "lost and found" bin.
I have used the same SA coat for several years.