Except there are no lederhosen anywhere to be seen here. To qualify as "Lederhosen" they MUST be made of leather (leder), and the hosen (pants) MUST end somewhere ABOVE the knees.
These pants are NOT made of leather, and they are too long!
Well, this boys' choir from Bavaria (Toelzer Knabenchor) wears traditionally only knickerbocker lederhosen as the boys' choir uniform; and has so from the start.