blouson; waist-length jacket
A short jacket, often with a gathered or elasticated waistband, borrowed from French.
from French
春先はブルゾンがちょうどいい。
A blouson is just right in early spring.
彼は黒いナイロンのブルゾンを着ていた。
He was wearing a black nylon blouson.
It got cold, so I put on a black blouson jacket.
I threw on a light blouson jacket before going outside.