Manual measurement. 3CM error within. Is normal. XS: Bust: 82 Waist: 64 Hips: 84 S: Bust: 86 Waist: 68 Hips: 88 M: Bust: 90 Waist: 72 Hips: 92 L: Bust: 94 Waist: 76 Hips: 96