I get slight quadboob, and my armpit tissue isn't properly contained; presumably the cups aren't high enough. The band is still a bit loose on me, but that's expected with my underbust measurement. It's very much a true "28, and if you're in between band sizes you may want to size up. I recommend sizing at least 1 cup size up from the regular Deco.
Please read my full review for more info!
http://petiteplentiful.blogspot.com/2013/07/review-freya-deco-strapless-28e.html
Updated on Jul 10, 2013 Flag this
It sounds like this style is too shallow for you. The Deco strapless is cut pretty differently from the Deco plunge.