We've got Spirit, Yes We Do!

So every Friday is spirit day at the boys' middle school.  If they don't have a specific day like Super Hero Day or Crazy Sock Day, then it's a color.  Yellow Day or Pink Day.  Last week it was Blue Day.  As I was dropping the boys off in the morning, a gaggle of girls walked past the car wearing blue t-shirts, blue tights and blue tutus that didn't cover their butts.  It looked like Pedophile Day.

Now I don't have girls so I don't have to deal with any of that stuff but when, exactly, did it become okay to not wear pants??