What are band sizes on bras, e.g. 32B? I don't get the band sizes

Bra Size Chart, Bra Size

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

Size Chart

Bra Size Chart, Bra Size

How I Gained A Cup Size Overnight, by Marissa Hastings, Your Breast Self

Playtex Women's Love My Curves Beautiful Lace & Lift Underwire US4825, Black, 36D at Women's Clothing store

How to measure bra size during pregnancy - Quora

ThirdLove Bra Size Chart - Find The Perfect Bra For Your Cup Size

The Perfect Bra Size? - Start With the Underband, Not the Cups!