No White after Labor Day—WHY?

No White after Labor Day—WHY?

An old custom prohibits the wearing of white after Labor Day. The explanations for this tradition range from the fact that white clothes are worse protection against cold weather in the winter to the fact that the rule was intended as a status symbol for new members of the middle class in the late 19th century and early 20th century.

So what is Labor Day and is it celebrated in other countries?

Wikipedia reports that:

Labor Day is an annual holiday celebrated all over the world that resulted from efforts of the labor union movement, to celebrate the economic and social achievements of workers. The majority of countries celebrate Labor Day on May 1, and it is popularly known as May Day and International Workers' Day.

The celebration of Labor Day has its origins in the eight hour day movement, which advocated eight hours for work, eight hours for recreation, and eight hours for rest.
Most countries celebrate Labor Day on May 1, known as May Day and International Workers' Day. In Europe the day has older significance as a rural festival which is predominantly more important than that of the Labor Day movement. The holiday has become internationalized and several countries hold multi-day celebrations including parades, shows and other patriotic and labor-oriented events.

May 1 is a national holiday in Argentina, Bangladesh, Belgium, Bolivia, Brazil, Bulgaria, Chile, China, Croatia, Cyprus, Czech Republic, Denmark, Egypt, Finland, France, Germany, Greece, Guatemala, Hungary, Iceland, India, Italy, Jordan, Kenya, Korea, Latvia, Lithuania, Lebanon, Malaysia, Mauritius, México, Norway, Pakistan, Paraguay, Peru, Poland, the Philippines (spelled as "Labor Day"), Portugal, Romania, Russian Federation, Singapore, Slovenia, Spain, Sweden, Syria, Thailand,Turkey, Ukraine, Venezuela and Vietnam. Also in Africa they are celebrating on May 1st. Algeria, Cameroon, Cote D'Ivoire, Egypt, Democatic Republic of Congo(DRC), Ghana, , Morocco, Nigeria, Senegal, South Africa, Tanzania and Uganda.