I saw another reviewer say this was like having a push up bra, and how great her tits looked... This slimmer only covers the outer potion on my breasts and flattens the area so much that my boobs look freaky. I am without a good pushup bra at the moment so I can't say what it would be like to have that aiding the appearance, but I have to say big chested ladies you will find this flattening part of your breast and giving an odd appearance. I did as another reviewer suggested and moved the cup area aside and around the outside of my bra, this was very uncomfortable in the shoulder area in just minutes I had to take it off. I have only used this in public once due to the chest flattening affects and had to wear a striped shirt so people would not be able to notice the odd shape it gave my breasts. As other reviewers mentioned regarding the crotch hole, it is small. I had difficulty opening it enough too. I read those reviews and thought those ladies did not know what they were doing but I have to apologize and admit I could do no better. :/ As for its slimming affects I notice no substantial change. As for its smoothing affects there is an improvement. With the right bra this might be a nice tool to give me more body confidence on date night, or make that dress lay better but on its own this slimmer needs improvement or at least a built in push up bra.