Longman Dictionary of Contemporary English
sports jacket
noun
EXAMPLES FROM CORPUS
▪ Harris tweed sports jacket, cavalry twill slacks.
▪ He was wearing blue-gray corduroy trousers, a sports jacket, no tie, lace-up shoes that had cost some money.
▪ He wore a brown sports jacket with a black roll neck sweater.
▪ Jacket taken: A sports jacket worth £100 was stolen from a car at Cod Beck reservoir near Osmotherley.
▪ They were both in their fifties - she in a tweed coat, he in a sports Jacket and flannels.
Wiktionary
sports jacket
alt. A tailored jacket that is not part of a suit; especially one of a sturdy fabric originally designed for outdoor sports. n. A tailored jacket that is not part of a suit; especially one of a sturdy fabric originally designed for outdoor sports.
WordNet
sports jacket
n. lightweight single-breasted jacket; often striped in the colors of a club or school [syn: blazer, sport jacket, sport coat, sports coat]