You will need a circular needle size US 10.5 (7.0 mm) at least 40” (100 cm), and as set of 4 double-pointed needles in the same size for the sleeves.

Yarn is held double throughout.

This pattern looks easy - it is not. Suggest that you read it through before starting.

Finished measurements:
Bust circumference - 41.5(45.25, 49.25, 53.25, 57)“ 105(115, 125, 135, 145) cm
Finished length - 26(26.75, 27.5, 28.25, 29.25)” 66(68, 70, 72, 74) cm
Sleeve to underarm join - 15.75(15.75, 16.25, 16.25, 16.25)“ 40(40, 41, 41, 41) cm

Yarn used:
Rowan Alpaca Classic
Shade 116 SOft Satin - 10(11, 12, 13, 13) balls