This cardigan is made with two hexagons. It comes in sizes from baby to adult. My example was made using dk / weight 3 yarn but this cardigan can be made with any weight yarn and hook as it is made to measure.

Gauge is not necessary as it is made to measure but this is what I got when making mine.
With 4.5mm hook
Row 1: Ch11, dc in fourth chain from hook, dc to end. (8)
Row 2-4: ch1, dc in same, dc to end. (8)

Square should measure 2"