A 28DD is small. VERY small. Its sister sizes are 30C and 32A. A

Is a size 28D almost 28DD bra small for a 16-year-old? - Quora

Bra Sister Sizes + Sister Size Chart

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Is a size 28D almost 28DD bra small for a 16-year-old? - Quora

Let's try again! Which size is bigger, 28DD or 34B? - Sexuality

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28 and 30 Band Size Bras – Harlow & Fox

Choose the correct bra cup size when changing band size

A 28DD is small. VERY small. Its sister sizes are 30C and 32A. A

I measured as said to do online in a calculator, and it came out

Petite Friendly Bra, 28C 28D Bras

What do the numbers and letters on bra sizes mean? - Quora

Petite Friendly Bra, 28C 28D Bras