gymslip

noun

1. A sleeveless tunic with a pleated skirt, most commonly seen as part of a girl's school uniform.

   “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.”