Bust/Chest: Measure bust wearing a soft bra. Under Bust: Measure directly,ensuring tape measure is level and pulled firmly onto the body. Waist: Measure around the waistline, ensuring tape measure is level. Hip: Measure around the fullest part of the body,approximately 21-23cm below waist ensuring tape measure is level. Notice: Swimsuit has good flexibility,Size for reference only.Compare the detail with yours. Please allow 1-3CM differs due to manual measurement,thanks!