Do you have wrinkled bra cup???? This could be as a result of the

Bra Fitting – is your cup half full or half empty?

Bra wrinkling on outer sides of cups 65G - Chantelle » C Chic Sexy Plunge (3641)

Cup fits but lace over the cup wrinkles, gore hurts to high Heaven 28GG - Cleo » Marcie Balconnet Bra (6831)

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How Should A Bra Fit?, Bra Fitting

Bra fitting assessment and alteration - ScienceDirect