Looking at getting new bras. Was fitted. Was 38E. New 38E bra appears to fit, according to fit guides. Old bras are 36DD. Appear to fit according to fit guides. Looked at each manufacturer's guidelines to see how sizes calculated. Each showed those sizes to be correct. Only differences is the look. In the larger one my bust looks lower. Looked at other manufacturers. All have different fit guides. Do I have to do this for each brand of bra now? Or is there a method that works for all or at least a majority of brands? The whole thing is complicated by having mastectomy and wearing a prosthesis. Arrrggghhh!