Simple crochet wrap: Pattern for sale. finished size is 15 wide by long. Crochet rectangle then add the extra inches in another stitch going in other direction for several inches until finished length.( 14 in or so) Cardigan button idea.
Free Crochet Rug Pattern DIY Free Pattern for Crocheted Patchwork Rug from Ravelry here. If you crochet or knit I’d suggest signing up for this site - it’s free and has many unbelievable free patterns. The PDF pattern for the rug is here.