From Longman Dictionary of Contemporary Englishbibbib /bɪb/ noun [countable] 1 
DHBDCCa piece of cloth or plastic tied under a baby’s chin to protect its clothes when it is eating2 DCCthe part of an apron, dungarees, or overalls that covers your chest3 → your best bib and tucker
DHBDCCa piece of cloth or plastic tied under a baby’s chin to protect its clothes when it is eating2 DCCthe part of an apron, dungarees, or overalls that covers your chest3 → your best bib and tuckerExamples from the Corpus
bib• His head had dropped forward and over his chest a great mat of blood had spread like a bib.• I felt like a country bumpkin in his bib overalls laughed right out of a formal ball.• When it came time for my client to testify, he took the witness stand in his bib overalls.• A lot of people still have that image of horseshoe pitchers being farmers in bib overalls.• It felt fun, like tying on a lobster bib.• Victoria's mucky bib came off her flower-sprigged Viyella dress and the chocolate pudding was sponged from her face.• First he threw down his training bib, then he tried to make a point to coaches Dino Zoff and Giancarlo Oddi.Origin bib (1500-1600) Probably from bib “to drink” ((14-20 centuries)), perhaps from Latin bibere; → BIBULOUS 