blazer (n.)youdaoicibaDictYouDict[blazer 词源字典]
"bright-colored jacket," 1880, British university slang, from blaze (n.1), in reference to the red flannel jackets worn by the Lady Margaret, St. John College, Cambridge, boating club. Earlier it had been used in American English in the sense "something which attracts attention" (1845).[blazer etymology, blazer origin, 英语词源]