These are the items I'd recreate it with:
My cardigans were generally hand knitted, and my school skirts used to be elasticated and pleated the whole way round, but this is a fairly good approximation. Missing, of course, is the school tie and the snotty tissue shoved up the sleeve of the cardigan. The blouses pictured are actually boys' shirts - the fitted girls' shirts were just too trendy to reflect that school photo!
Just for fun, here are a couple of later school uniform photos: