This bib is oh so easy to crochet or knit up. Simply knit or crochet a square - on the top edge add a buttton hole for knitting. To make a button hole with crochet, simply chain three at the beginning of the row and connect to the third chain with a slip stitch and then single crochet across the row. Add one more row of single crochet and then crochet across just five stitches across to form the tie. Sew a button on the end. I like using wooden buttons or repurposed buttons from old garments.
Cotton works well and washes well.