This pattern is written for sizes children (2,4,6). Rather than suggest a specific yarn, it calls for worsted weight yarn and recommends amounts by weight.

Main color: two 4 oz. skeins
Green for fence band: one 4 oz. skein
Black for sheep: one 2 oz. skein
Band background colour: on3 4 oz. skein
White for fence and sheep: one 4 oz. skein

(Pattern available from various vendors; described as having six sizes for the whole family: 16” toddler to 22” extra large adult.)