Bras

 The size refers to the measurement of the band around the torso, just below the bust, which means it measures the body contour. 

Bra Size	Underbust Measurement (cm)
70B	78-80
75B	83-85
80B	88-90
85B	93-95
90B	98-100
95B	103-105
100B	108-110
105B	113-115