With a bra on, wrap a tape measure snugly, but not too tightly, around your rib cage, just below your bust line. This is your band size (US/UK sizing uses inches).
Then, wrap the tape measure around the fullest part of your bust. If the difference is:
1" / 2.5cm your cup size is A
2" / 5cm your cup size is B
3" / 7.5cm your cup size is C
4" / 10cm your cup size is D
About the Designer
Apparel brand Onzie was launched by a 20-year practitioner of Bikram Yoga, who was inspired to create modern athletic gear based on traditional yoga wear. The Onzie philosophy of "keep your practice challenging, and your wardrobe simple!" comes through in its easy, versatile clothing, which is cut from breathable, fast-drying material and designed to offer comfortable support through any level of activity. All Onzie apparel is composed of materials made in the USA, and the pieces are designed and manufactured in Los Angeles, California.