Ladies cardigan made with DK.

To fit chest:

32-34" | 81-86cm - 750g / 46cm open end zip
36-38" | 91-97cm - 750g / 46cm open end zip
40-42" | 102-107cm - 900g / 46cm open end zip
44-46" | 112-117cm - 900g / 51cm open end zip
48-50" | 122-127cm - 1050g / 51cm open end zip

You will need:
4mm needle
3.25mm needle