It's one of fashion's most well-known rules, but where did it come from?

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After a quick google search two things are clear; A lot of people are curious about the origin of this rule, and the answer isn't all that clear.

The best (or most popular) explanation is that white fabric is lighter and keeps you cooler in the summer. According to Elle Magazine, it originated during the days of pre-air conditioning as a way for the upper class to stay cool.  That makes sense, but why suddenly stop after Labor Day?

Honestly, there's no reason to.