Size Guide

Size 6 Size 8 Size 10 Size 12 Size 14
Bust

32.5 inches

83cm

34 inches

87cm

36 inches

92cm

38 inches

97cm

40 inches

102cm

Underbust

25.5 inches

65.5cm

27 inches

69.5cm

29 inches

74.5cm

31 inches

79.5cm

33 inches

84.5cm

Waist

25 inches

64cm

26.5 inches

67cm

28 inches

71cm

30 inches

76 cm

32 inches

81cm

Hip

34.5 inches

88cm

36 inches

92cm

38 inches

97cm

40 inches

102 cm

42 inches

107cm

 

HOW TO MEASURE YOUR BUST
Measure at the fullest part of your chest. This means wrapping the tape measure around your chest and over your breasts at their fullest part.
Wear a supportive bra to ensure your breasts are being held in the correct place.
Wear the kind of bra, which you would be wearing with the intended item of clothing, to ensure you get the right look.
Take at least 3 measurements and go with the widest one as the most accurate
HOW TO MEASURE YOUR WAIST
Make sure that you are measuring the right part of torso.
The waist is the smallest, or narrowest part of your body. This should be somewhere between your navel and your ribcage.
Bend sideways, if you still can’t figure out exactly where your waist is. The part that contracts or creases is your natural waist.
Make sure you are standing up straight, but slightly relaxed.
Make sure you measuring tape is straight. 
HOW TO MEASURE YOUR HIPS
Make sure you measure the correct area. Your hips are the widest part, so your measuring tape should go all the way around your bottom.
Take more than 1 measurement and go with the widest one.
Make sure you stand straight.
Make sure you stand with your feet together, as having your feet apart can create a measurement that is larger than your hip area.
Make sure it is a snug fit around your hips. 
Now you know how to correctly measure yourself, you can ensure that your clothes always look and fit like a glove.