Don't be shy to ask... Last time my wife ask me to buy her a branded brassiere way back home due to excitement I forgot to ask her size when I'm infront of the saleslady she asked me what size I'm looking for then I said I don't know. Since it's not measured as S, M, L, XL, or XXL just like other garments and after looking on her front I tell her it seems that you both have same size, she smiles then she gave me one and purchased it. At home my wife told me it's perfect!