The A-cup bra generally is considered the smallest bra size available. AA and AAA sizes do exist, but they are fairly difficult to find. Having a small chest offers you several perks. You can get
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A Isn't Actually the Smallest Bra Size – Shop AA and AAA Cup Bras
A Isn't Actually the Smallest Bra Size – Shop AA and AAA Cup Bras
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27 Places to Find AA & AAA Cup Bras
AAA Cup Bras Ultimate Small Bras Resources For Very Small Busts
Would you date an AA cup size girl? - GirlsAskGuys
AAA Cup Bras Ultimate Small Bras Resources For Very Small Busts
Bra Size Measurement & Cup Size A, B, C, D, DD Bra Sizes AND
27 Places to Find AA & AAA Cup Bras
What is the difference between a 36 A and a 36 AA bra size? - Quora