Why do bra sizes go from D, DD, to DDD instead of just going from

Double D Bra Size: Understanding DD Cup Size, Boobs and Breasts Size - HauteFlair

List of Bra Sizes

How do websites have the bra size of actress? - Quora

The Difference Between D And DD Bras Explained

You will get 6 pcs bras with 6 different colors as shown on image at one price. The cup is molded cup with full coverage with underwire.  It is

Women Bras 6 Pack of T-shirt Bra B Cup C Cup D Cup DD Cup DDD Cup 38D (S9298)

Have you ever thought about how we came up with the idea for bras and made certain sizes that are the “standard sizes”? How did we figure that out? - Quora

Which US state has the largest average bra size? - Quora

JUST BEHAVIOR Adhesive Bra Strapless Sticky Invisible Push up Silicone Bra for Backless Wedding Dress Beige B Cup at Women's Clothing store

Why doesn't Victoria Secret carry bras larger than a cup size DDD? - Quora