The origin of the idiom can be traced back to the practice of wearing one's best or finest clothing on Sundays, traditionally considered a day of religious observance and rest. It is used to refer to one's finest or most formal clothing, typically reserved for special occasions or events. The phrase conveys a sense of dressing up or making an extra effort to look one's best for a particular event, such as a wedding, a job interview, or any situation where a more formal or distinguished appearance is desired. It is often associated with wearing formal or dressy clothing rather than casual or everyday attire.

英語での「Sunday best」の定義と意味

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