The Belle Bracup sports a thin strap feature, offering optimal support with its underwire finish and adjustable back. Perfect for bust cups A through D. Perfectly paired with the Ty Bottom in Autumn Rose. Generally, we suggest: Size XS = A cup, Size S = B cup, Size M = C cup, Size L = D cup, Size XL = DD cup. However, please consider this together with our size guide, the style of the garment and your full bust circumference.