How do bra measurements and sizes work? This makes no sense to me

How To Find The Right Bra Size

How to know your bra size without a measuring tape – Playful

How do bras actually work in detail? - Quora

What does it mean when a bra band is loose? Does it mean the cup size is smaller? - Quora

Lingerie and Swimwear Measuring Guide

Sister Sizes, Bra Fit Guide & Size Charts

I do not know which bra cup is suitable for me, my under burst is 40 inches and my upper burst is 47 inches, so what bra size is best for me? - Quora

Finally, Bra Sizes Explained – Understanding How Bra And Cup Sizes

How to measure your bra size from home: in 4 easy steps