With sports bra they go off width huni to get your true size so your best off going to debhams and having a fitting in sports bra with all my 3ops I’ve used Shock Absorber sports run bra which is the best out there at them I’m 2 weeks post op with my 3rd im 34GG/H and this sports bra I’ve got on now is 34F and still got loads of room but it’s like a snap back in it so grows up n down with the size of breast the girls are trained up debhams pre op post op girls x