1. Measure the relevant parts of your body as per the instructions below.
2. Use those measurements against the appropriate size guide from the list shown here.
3. Select the size that is closest to, but not below your measurement.
Measuring your chest
Measure around the fullest part of your chest, keeping the tape level under your arms and across your back.
Measuring your waist
Easy – just measure around the narrowest part of your waistline – usually it's just above your belly button.
Measuring your hips
Simply measure around the fullest part of your hips.