This year some of the old clothes are used to make new garments. It may look a little odd that shorts are supposed to be worn with a sundress, but imagine how much legs you can flash if you try to use a bicycle in a short summer dress, and it may not be so odd anymore. My mother remember that when she graduated from schools, my grandmother made a pair of matching shorts to the graduation dress, so my mother would show of her knickers when she was hoisted. Evidently hoisting was part of the celebrations... This was in the sixties, not the forties, but the idea is the same.