Crossword Genius

Old-fashioned school uniform (7)

Ross

I believe the answer is:

gymslip

(Other definitions for gymslip that I've seen before include "Schoolgirl's PE uniform" , "schoolgirl attire" , "Girl's short sports dress" , "Pre-Lycra exercise wear" , "old girl's uniform" .)

I've seen this clue in The Guardian.
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