See the cardigan page here.

Also requires four 5/8” buttons.

From the magazine: Little mermaids will love the ruffling that anchors both the tank dress with bubble pockets and its matching ribbed-collar cardi.

Knit tip: the ruffled hemlines and cardigan sleeves are formed by decreasing a third of the stitches on one row with smaller needles, then switching back to larger needles.