Where did this “outdated” etiquette rule come from, and does it still apply?
And, more importantly, does it still apply?
Some suggest that it might have been born out of function.

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Southerners happen to fall in both camps.
(But that’s not to say that everyone agreed.
Coco Chanel, for example, famously wore white year-round.)

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Etiquette expert Emily Post agrees that you could wear white every day of the year.
The decision is “more about the fabric choice today than color.”
Post recommends to instead “wear what’s appropriatefor the weather, the season, or the occasion.”

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Except at aSouthern wedding, that’s always a no-no.