As in the United States, actual sizing for Australian women's clothing varies between brands. The best way to make sure you're getting the appropriate Australian size of women's clothing is to take your key measurements--bust, waist and hips--and consult a sizing chart from the appropriate manufacturer to determine which size you're actually supposed to be wearing. Alternatively, if you know your clothing size in U.S., U.K., Japanese or European sizing, you can convert that size to an Australian size with the online women's clothing size converter (see Resource).
Strip down to your undergarments and, if possible, ask a trusted friend to help you take your measurements.
Have your friend wrap the measuring tape around your chest. It should cross over your shoulder blades and the fullest part of your bust, and lay horizontal all the way around your body. Keep your arms down by your sides as you do this, and have your friend read the measurement in centimetres.
Wrap the tape measure around your natural waist; this measurement you can do yourself. If you're not sure where your natural waist is, bend to either side and look in the mirror. Locate where your skin folds as you bend. This is your natural waistline.
Measure around the fullest part of your buttocks, with the tape held horizontal to the ground. This is the hip measurement.