wrinkling in cup, size problem or shape issue? band too tight? 34F

I need larger cups sizes and bras of a different shape more for shallow breasts. Unfortunately I can't try that

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I have nearly every sign that my bra cup is too small, yet they crinkle at the bottoms. Is there anything I can do to fix this? I am currently wearing a

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wrinkling in cup, size problem or shape issue? band too tight? 34F - Vero Moda » Dorado (10088907)

Bra Fitting Guide – Harlow & Fox