Originally: †(of clothing, a horse's trappings, etc.) ordinarily worn, for everyday use (obsolete). In later use more generally: habitually or…

Of, relating to, or associated with a workday or its activities. Hence: ordinary, routine, humdrum. Cf. workaday, adj.

Of, relating to, or associated with a workday or its activities; (hence) routine, ordinary, humdrum; not special, unusual, or interesting in any…

Of an article of clothing: worn on ordinary days or weekdays, as opposed to Sundays or special occasions.