You will need a stitch marker.
You will also need circular needles in size US 4 (3.5 mm) in two lengths - 16” (40 cm) and 32” (80 cm)

Finished measurements:
Circumference at bottom of garment: 46(56.5, 57.75)“ 117( 143.5, 172) cm

Finished length is dependent on row gauge, but as written, the largest size is approximately 1.5” (3.75 cm) longer than the small and medium sizes.

Yarn used:
Rowan Pure Cashmere
Shade 095 Light - 3(4, 5) hanks