You could use any 4ply/sport weight yarn If you use a DK weight yarn (and a 3.5mm hook) you will probably eliminate the last 2 rows in order for crochet piece to fit. Pattern gives instructions to make 2 pieces (halves) which you sew together over your ball. Link of the pattern is below!
by Carmen Heffernan
Christmas Bauble [ FREE CROCHET PATTERN ] downloadable pattern is available here.