It’s the question that has been keeping us awake ever since Episode 112, but sweet merciful Jesus has delivered Joanna in Southam to us to vanquish the mystery and, at last, lay our minds at rest:
I, as a previous backward blazer wearing school girl believe I can answer this question.
1) Basically we don’t want to wear them as they don’t fit well/are unflattering/it’s not cool.
2) However we are cold so need to hold them up to cover our fronts to keep us warm.
3) This also pleases our parents as it keeps them off the floor.
So there we go. Next week: why do they roll their sleeves up in Miami Vice?