Measure around the fullest part of your bust.
Wearing a bra or similar support garment you plan to wear with your dress, measure around the fullest area of your bust. This helps ensure the best possible fit. Keep the tape measure level with the floor as you wrap it around your back and bring it forward across the fullest point of your bust to complete the circle. Keep in mind that your bust measurement is different from your bra size.
Measure around the most narrow part of your waist.
Getting an accurate waist measurement is essential, as it often plays the biggest role in determining size. Your natural waist is usually the narrowest part of your midsection, located just beneath your ribcage and roughly two inches above your navel. A simple way to locate it is to lean to one side, the crease that forms is your natural waistline. Wrap the tape measure around this spot, making sure it stays level with the floor. Be sure the tape is pulled firmly against your skin, but not too tight, to ensure precision.
Measure around the fullest part of your hips.
Stand naturally and place the measuring tape around the fullest part of your hips (typically around your bum), ensuring the tape stays level with the ground. For the most accurate results, make sure you're wearing snug fitting clothing during this process.