Always measure your actual body, not clothed body to get an accurate reading for sizeing. It is advisable to wear a non padded bra to get more accurate bust measurement

Bust - Measure around the fullest part of your bust and across your shoulder blades.

Waist - Keeping the tape measure taut, measure around your natural waist.

Lower Hip - With your legs together, measure approximately 20cm down from your natural waist and measure around the lower part of your bottom.