If you've worn a button down shirt in, oh, the last 100 years or so, you may have noted an interesting feature: the last button hole and button thread are sewn with a different, contrasting color than the rest, particularly in solid color shirts. Or, you could be like me, and have worn button down shirts thousands of times over your existing decades, only to recently realize the thread color was different, and, once aware, started noticing it everywhere. Or perhaps you just looked down as you were reading this and learned that it is indeed true of the shirt you're wearing right now... Regardless, the question stands:
Why? Why are the bottom hole and button sewn with a different color thread?
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