Ewa Michalak (also known as Effuniak) is a Polish bra manufacturer. Their sizing follows European bands with UK cup sizing with non-custom orders ranging from 65 to 95 bands in A to K cup sizes, although the non-custom bra size range varies with different bras. As of Aug. 2023, the band sizes listed on her website are 55 - 140 EU band size (approx. 26 UK - 60UK), though she does list one bra (CHP Roxana) as available in sizes 50D-50G (approx. 24D - 24G UK size), and 55C - 55FF (approx. 26C - 26F
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