your best bib and tucker

(one's) best bib and tucker

One's dressiest or most formal attire. A "bib" and a "tucker" are now-outdated clothing embellishments. Be sure to wear your best bib and tucker to the gala tonight
See also: and, bib, tucker

your best bib and tucker

OLD-FASHIONED
If you are wearing your best bib and tucker, you are wearing very smart, formal clothes. The conference guests all turned up on time in their best bib and tucker. Note: In the past, a `bib' was the part of an apron which covered the chest. A `tucker' was a decorative part of a woman's dress, covering her neck and shoulders.
See also: and, bib, tucker