Apparel is a hypercompetitive business. Going through boom and bust trends, the apparel shopper can switch habits on a dime, sometimes to the detriment of investors. Lululemon
$Lululemon Athletica (LULU.US)$ investors are feeling this volatility at the moment. The stock is off 43.5% from recent highs as of this writing due to a huge slowdown in its core North American market. Wall Street is worried about upstart competitors tak...