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

The Difference Between D And DD Bras Explained

List of Bra Sizes

What size bra is one up after 42DD? - Quora

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The Difference Between D And DD Bras Explained

How To Measure Your Bra Size at Home: a 5-Step Guide

In bra size, when there's an E, F, G, or H, what are the equivalents in DDDs? - Quora

What are the different bra sizes? What does the number and letter represent respectively? - Quora

My mom is an A cup and my dad's mom is a B cup, will my bra size be close to this? - Quora

Understanding Bra Sizes - Curvy Bras