About 3-1/2" x 9-1/2" to fit a standard coffee or tea mug
Yarn amount is sufficient to make 4-5 Cozies.
12 half double crochet + 10 rows = about 4"
BE SURE TO CHECK YOUR GAUGE.
Row 1: Half double crochet in 3rd chain from hook and in each chain across.
Row 2: Chain 2, turn. Half double crochet in each stitch across - 29 stitches at the end of this row.
Repeat Row 2 until piece measures about 9-1/2", when slightly stretched.
Sew short sides of Cozy together for about 1/2" at top and at bottom, leaving remaining 2-1/2"open for mug handle.
With sewing needle and thread, sew button, centered, onto one edge of handle opening. Use spaces between stitches as buttonhole.