A 28DD is small. VERY small. Its sister sizes are 30C and 32A. A 42DD is

Sister size, Bustyresources Wiki

Bra Size Calculator

Sister Sizes, Bra Fit Guide & Size Charts

True & Co. True Everybody Women's Adjustable Strap Scoop Neck Bra

Bra Fitting: Guide to Fitting the Right Bra for You

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

Sister Sizes: The Bra Secret Every Person Should Know – Sister

Everything You Need to Know About Bra Sister Sizes - The Melon Bra

What Are Bra Sister Sizes And Why Do They Matter? - SHEFIT

Should I go up or down in sister sizes? I'm wearing a 42D but the

Explaining Bra Sizes - What are Sister Sizes? :: Beauty and Clip

Bra size - Wikipedia