This is obviously a joke and a figment of someones imagination. And if any real sign was put up it has no backing and few if any people will listen to it. But the truth is, the is not a new concept. In some chassidishe circles, bachurim wear “kashketlach” in the weekdays instead of regular biber hits for this very purpose, the fact that they are more affordable. Kashketlach are small caps worn by children under bar mitzvah on Shabbos in some chassdish circles. Similar to what the Chofetz Chaim is known to have worn. In many places in Europe, even men wore them during the week.
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