The Hemline Index Is a Myth. So Why Won't It Go Away?

The Hemline Index — the notion that hemlines rise during economic upswings, and head towards the floor in downturns — is still kicking around. For no good reason, frankly, as it's an unreliable indicator of anything other than fashion trends. And yet it persists, year after year, season after season. What is it about… » 2/23/12 1:20pm 2/23/12 1:20pm