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 your natural waistline.

Hips: measure around your hips, 20cm (8") below your natural waistline.

Inside Leg: measure from the crotch to where your trouser is normally worn on the shoe.

Jacket Length: measure from the centre back of your neck to your hemline. Then length measurement will vary depending on the style of garment.