materials:

Size 16, 5 X 1 oz balls
Size 18, 5 X 1 oz balls
Size 20, 6 X 1 oz balls
3 buttons

bramble pattern: multiple of 4 stitches + 2

1st row: purl
2nd row: knit1, * purl3 together, (knit1, purl1, knit1) into next stitch, repeat from * to last stitch, knit 1.
3rd row: purl
4th row: knit1, * (knit1, purl1, knit1) into next stitch, purl 3 together, repeat from * to last stitch, knit 1.

these 4 rows form pattern.