Athleta racerback swim 2 piece bikini top bottoms Size Medium 3

Athleta 2 piece bikini swimsuit. Top is size 3. I'm not sure what size that is, feels like a medium?? It measures 14.75” across the bottom edge of the top. Removable padding. Different adjustments on there back strap. Bottoms are size medium. 15” across the waistband. Excellent condition.