To befit someone or something is to be proper or suitable for them — the right size of behaviour, dress, or honour. “Silence befits a library.” “She wore the calm that befits a judge.” It is formal and a little old-fashioned; in speech we say “is right for” or “suits.” A very common shape is as befits: “He spoke simply, as befits a good teacher.” Though actually we use it more about dignity and manners than about clothes that fit your body — that plainer job still belongs to fit. You will mostly see it in writing, ceremonies, and slightly grand talk. It is not a word for “help” or “do good to”; that is a different cousin in sound.

相稱、適合（文雅；指身分、場合該有的樣子）。