HOTmilk Sizing Guide:

These are some instructions on how to measure your bra size at home, so that you can order online and get the best fit right the first time.  We recommend that you do your measuring in your current best bra in front of mirror to ensure the most accurate measure.

Cup Measurement (A):
Measure around the fullest part of your breast. Check in a mirror side-on that the tape is even and straight. Take a loose measurement.

Band Measurement (B):
Measure directly under your bust. Place the tape measure around your torso, just under your bust. Check in a mirror side on that the tape is even. Take a firm measurement - pull reasonably tight.

HOTmilk Sizing Guide Chart :