What is the reason why Lithuanian & chabad style frocks have two buttons on the back of them ?
closed as off-topic by rosends, robev, Yaacov Deane, Gershon Gold, Alex Dec 18 '18 at 1:07
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The formal frock coat, on which they are based, traditionally had two buttons in the back. See this Wikipedia article about frock coats, which says
The formal frock coat only buttons down to the waist seam, which is decorated at the back with a pair of buttons.