You will need one button. Rowan used #BN1610 from Bedecked in the UK, show sewn on the reverse side.

Finished measurements:
Bust circumference: 58.25(62.5, 65.5, 69.75, 74)“ 148(159, 166.5, 177.5, 188) cm
Finished length: 24(24.75, 25.5, 26.5, 27.25)” 61(63, 65, 67, 69) cm
Sleeve to underarm:
13.5(13.5, 13.75, 13.75, 13.75)“ 24(24, 35, 35, 35) cm

Yarn used:
Rowan Felted Tweed
Shade 191 Granite - 8(9, 9, 10, 11) balls

add Japanese book source
one size 150cm bust