Needles needed:
12mm needles, a US17 is closest at 12.75mm

Sizes (by UK dress size):
10 - to fit bust 32”/81cm; actual size 29.25”/74cm
12 - to fit bust 34”/86cm; actual size 30.75”/78cm
14 - to fit bust 36”/91cm; actual size 32.25”/82cm
16 - to fit bust 38”/97cm; actual size 35”/89cm
18 - to fit bust 40”/102cm; actual size 37”/94cm
20 - to fit bust 42”/107cm; actual size 38.5”/98cm

Yarn Requirements: Ribbon yarn, 50g
8 (9, 9, 10, 10, 11) balls