The school apron (school uniform) was first worn by girls. Initially, it was of black color until the year 1965, when changed from black to blue.
Then, it also acquired white discreet details, pleats, cuffs, pockets, detachable collar, etc. The well ironed white collar was a sign of cleanliness and housekeeping.
Boys also wore an apron, and it was as short as a jacket.
In kindergarten the girls wore pink, and the boys wore blue.
The school apron in the early 1980s and more specifically on February 6 ceased to be compulsory at school.