bm dress?

Hi ladies. I have been looking for bm dresses the past month. I'm looking for purple, but am having trouble finding the exact hue I want. I like dessy's african violer shade but didn't like the dresses. Right now I am considering Bill Levkoff's Euro Eggplant, but it is not the shade I originally envisioned for my wedding. Did anyone else have trouble finding the right hue for bm dresses? Can anyone recommend a place with a large selection of dresses?

Also I came across this picture of bridesmaids and I like the color. Does anyone know the designer of this dress?

Thank you in advance!