You may wish to use a size US 10.5 (6.5 mm) circular needle 32-40” (80-100 cm) for the bottom half of the body if desired.
You will need stitch holders and 6x 7/8” (22 mm) buttons.

Finished measurements:
Chest circumference: 36.25( 40, 43.75, 48.5, 52, 56, 60.75)“ 92( 102, 111, 123, 132, 142, 154) cm
Finished length: 22.75( 23.75, 24.5, 25.25, 26, 26.75, 27.5)” 58( 60, 62, 64, 66,68, 70) cm
Sleeve seam: 18( 18.5, 18.5, 19, 19.25, 19.25, 19.25)“ 46( 47, 47, 48, 49, 49, 49) cm

Yarn used:
Hayfield Spirit Chunky
Shade 430 Tranquility - 6(7, 8, 9, 9, 10, 11) balls