Answer (1 of 6): In the past, it was common practice to add 3-4 inches to the underbust measurement when calculating the bra band size. This was done because bras were typically made with less stretchy materials and could be uncomfortable if they were too tight around the ribcage. Adding a few in
The Perfect Bra Size? - Start With the Underband, Not the Cups!
How To Measure Your Bra Size - Chatelaine
How To Measure Bra Size: The Vogue Guide
What bra size do I have if my underbust measurement is 68cm and my
Eve Classic Bra Band - Porcelynne Lingerie Supplies
The Perfect Bra Size? - Start With the Underband, Not the Cups!
Why Is Bra Sizing So F**ked Up and Can Anyone Fix It? - Elisabeth Dale's The Breast Life
Is a 38D equivalent to a 40C? - Quora
Find Your Bra Size : 3 Steps - Instructables
The Perfect Bra Size? - Start With the Underband, Not the Cups!
A guide to pattern cup sizes (and a handy reference)
How many inches does one lose when going down one band size on a
Have you shown your boobs to a tailor to take measurements? How
Bra Sister Sizes + Sister Size Chart