I don't know whether I read this on here, or whether I heard someone say it, but it was suggested that place like Bravissimo are inventing sizes so that the customer has no choice but to go to them 'cause they're the only place that do that size. I've never been measured for a bra....obvs have measured myself and on the whole have been successful. I remember seeing the first infomercial for the Ahh bra so I tried one out and I've never looked back since and that is all I have in my collection. I don't go in for strappy, low cut or backless garments so it's not a problem. The damn things are so bliddy comfortable, and like I say I stick with the Ahh Bra brand because the sizing is spot on...a lot of the cheaper ones come up smaller. I did buy a cheapo set from Bid once and the sizing was good, however they were unbranded so I've no idea where I could repeat purchase. Mind you if I can buy a four pack brand new with tags and packaging from Ebay, then I'm happy! I find it so much easier to go for a size that corresponds with your dress size and I find these bras just as supportive as regular ones..even underwired ones. I'm not well endowed so I don't know how they'd hold up on a larger busted woman.