Pattern also includes instructions to knit this as a sleeveless waistcoat (separate Ravelry entry here).

Sizes (by UK dress size):
10 - to fit bust 32”/81cm; actual size 33”/84cm
12 - to fit bust 34”/86cm; actual size 35”/89cm
14 - to fit bust 36”/91cm; actual size 37.5”/95cm
16 - to fit bust 38”/97cm; actual size 39.5”/100cm
18 - to fit bust 40”/102cm; actual size 41.25”/105cm
20 - to fit bust 42”/107cm; actual size 43.75”/111cm

Yarn Requirements: DK weight, 50g balls
Jacket: 9 (9, 10, 10, 11, 12) balls
Waistcoat: 6 (7, 7, 7, 8, 9) balls

Also Needed:
3 buttons

Note:
Also suitable for Sirdar Escape DK. Amounts may vary.