Take your actual body measurements as they are more accurate than measuring over your clothes.
Bust
Measure around the fullest part of your bust and across your shoulder blades>
waist
Measure around the natural waist, keeping the tape measure taut
Hips
Stand with your feet together. Put the tape around the fullest part of your bottom at the top of your leg, about 20cm (8’’) below your natural waistline.
Inside Leg
Measure from the centre back of your neck to your hemline. Then length measurement will vary depending on the style of garment.
Jacket Length
Measure from the top of the inside leg at the crotch to where the trousers are normally worn on the shoes.