WASHINGTON — Labor Day marks the unofficial end of summer as most Americans bask in the final three-day weekend of the season.

The federal holiday, which is celebrated the first Monday in September, honors the U.S. labor movement and the achievement of American workers. Millions of Americans celebrate with beach getaways or barbecues while others take advantage of the plethora of sales available.

The holiday's origins date back to the gilded age as activists sought to establish a day to honor workers in the late 1800s. Each year, the holiday also brings about a popular adage: One should not wear white after Labor Day.

Here's what to know about the "fashion rule" that is tied to the holiday.

Fashion experts say it likely goes back to the Gilded Age — the same period that spawned La

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