What does "gymslip" mean?

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

What is a synonym for "gymslip"?

Common synonyms include: athletic dress, gym dress, pe dress, sports dress.

noun

noun ·Rare ·Advanced level

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 […]"
2
a sleeveless tunic worn by English girls as part of a school uniform wordnet

"I've seen this child in her gymslip and school blouse […]"

From gym + slip.