Gymslip
"Gymslip" in a Sentence (3 examples)
I've seen this child in her gymslip and school blouse […]
She'd swapped the print dress for a plain white blouse and brown gymslip.
Boarders wore navy pleated skirts with white blouses; day girls had brown gymslips, cream blouses and beige jumpers. Lisle stockings could be a nuisance, as were hats and gloves.