Spring is for White
So why don't we wear white after Labour Day? Many feel it's as simple as weather. You'd wear white to stay cool and when putting the slipcovers on the furniture in your summer home you'd move back to northern cities such as New York. White seemed impractical in the rain. Theories that dispute this give no interesting reason to contradict practicality, tradition and etiquette.
But if you insist on breaking the rule, Coco Chanel beat us to it whom made it a staple to wear white year-round.