bluer

1. (UK, school slang) A blue blazer, part of the school uniform at Harrow School.Examples: "Bluer buttons illustrate the principle of 'keeping under'. The Knoll rule book states: 'It is a one year priv. [privilege] to have the bottom button on one's bluer undone [and] a three summer priv. to have all the buttons of one's bluer undone.'"; "He was alone in his room, in his bluer and his tie, seated on a chair, leaning over his bed like a desk—his preferred way to study—holding the stapled pages of the script, muttering the words."UK