You will need a size US 3 (3.25 mm) circular needle.
You will also need stitch holders.

Finished measurements:
Bust circumference: 33.25( 37, 40.75, 45, 48.5, 53.25, 56.75, 60.5, 65.5)“ 84.5( 94, 403.5, 114.5, 123.5, 135, 144, 153.5, 166.5) cm
Finished length: 18( 19, 19.75, 20.5, 21.25, 22, 22.5, 23.25, 23.5)” 46( 48, 50, 52, 54, 56, 57, 59, 60) cm
Sleeve length: 18(19, 19.75, 20.5, 21.25, 22, 22.5, 23.25, 23.5)“ 46( 48, 50, 52, 54, 56, 57, 59, 60) cm

Yarn used:
Rowan Cotton Cashmere
Shade 226 Ecru - 5(5, 6, 6, 6, 7, 7, 7, 8) balls