Take all measurements over underwear only, using a soft tape measure. Keep the tape snug but not tight.

Measurement 0 1 2 3 4
IT size 34 36 38 40 42
Height (cm) 166 168 170 172 174
Bust (cm) 80–84 84–88 88–92 92–98 98–104
Waistline (cm) 62–66 66–70 70–74 74–80 80–86
Low waist — 6 cm below bellybutton (cm) 68–72 72–76 76–80 80–86 86–92
Hips (cm) 88–92 92–96 96–100 100–106 106–112
Center back to wrist (cm) 74–76 76–78 78–80 80–82 82–84