shorts; short pants
Casual term for shorts, often referring to athletic or casual wear. More informal than 半ズボン.
夏はいつも短パンで過ごしている。
In summer I always wear shorts.
In summer I often go out wearing shorts.
We change into shorts for PE class.
彼は短パン姿で公園を歩いていた。
He was walking in the park dressed in shorts.
長ズボン means long pants/trousers, the direct opposite of the short-length 短パン.
短パン means 'shorts' (short pants) and has nothing to do with bread, despite sharing the syllable パン with パン.
arrival at ... · counter for suits of clothing · nth place (in a race) · counter for moves (in go)
Abbreviation of 短い (みじかい, 'short') + パンツ ('pants'), forming a casual compound for 'shorts'.