The pattern is available free here

You can always use other granny square motifs to substitute.
This top allows to use left over yarn from similar weight range.

MATERIALS
White Yarn: DK, light worsted, 100% cotton or equivalent, knitting gauge = 24 sts x 34 row (4″ with size 3mm needle) – 100g
Pink, Yellow, Blue, Green, and Brown Yarn: DK, light worsted, 100% cotton or equivalent, knitting gauge = 24 sts x 34 row (4″ with size 3mm needle) – 30g each
Button: 1/2″
Elastic thread

TOOLS
Crochet hook: 3.0mm {for granny square} & 2.5mm {for bands and hems}
Tapestry needle