I don't know, it just doesn't fit. The cups feel too small and too large at the same time - the upper cups are gaping and I'm also spilling. Otherwise, it's a really nice bra. Comfortable enough for a strapless and has a great design. On the negative side, it tends to create a reverse muffin if you are not super slim. I also experienced that it might slide down a little bit during wear, but that is quite easily adjusted. I should add that I bought this second hand and don't know how much it has been previously worn, perhaps it's features were better when it was new. I would say, if it fits your shape then you will love this bra.
The cut of this brassiere seemed like it would make a great strapless that wouldn't slide down, with a low back for dresses....however, the actuality of it is disappointing. Because of the low back feature, there is no support/pressure directly behind the cups, which causes them to gap and not tack at all. The brassiere goes down so low on the waist, that when it ends, there is serious reverse muffin-top. They also don't have this in anything less than a band size 32", so my normal 28-30F was right out. Cup and band size seem true to size. Unsure if this would even be comfortable for all day wear due to the ribbing.