Without a collar; describing a garment or neckline that has no collar attached.
From 'collar' + '-less' (Old English 'leas', meaning lacking or without). This compound emerged in the 19th century as collar styles became more variable in fashion.
The shift from 'collarless' shirts becoming acceptable for men only happened in the 1960s—before that, going without a collar in public was considered slovenly, showing how clothing rules are really about enforcing social conformity, not comfort.
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