Facebook Twitter Pinterest If you are unsure of which size to order. use the table above to find your UK size. Please note. sizes vary from brand to brand and measurements are intended as a guide only. Measure around the fullest part of your bust. with your arms by your sides and the tape measure flat against your back. Measure around your natural waistline. between your navel and the bottom of your rib cage. With your feet together. measure around the widest part of your hips. ensuring the tape measure is level throughout.