For some reason I can't respond on your thread below, so I'm responding here instead.
My BM's dresses were by Dessy, and they all got them for around $150 or less. They tried on dresses and got measurements in BM dress shops, then they all ordered their dresses from one online vendor at the same time (same batch, and all that jazz). The dresses arrived on time, and in good condition. This also allowed me to see one of my BMs in the dress before she ordered it, which I liked (the others are long-distance). You might want to consider going this route.
As for picking out dresses for different sized BMs, as you can see from the pics in my bio, I had BMs of different shapes and sizes, as well, so I selected a color that I thought would look good on all of them, told them to all get dresses from Dessy in that color, knee-lenghth or tea length, in georgette material, and they got to select the style that they preferred. I think they appreciated that, and I was really happy with how unique but still coordinated they looked on the day of.
For material, you might want to consider georgette - it's still flowy, butworked better on all body sizes than chiffon. Also, encourage them to get lined dresses - it really helped my girls feel confident in the wind to know that even with their flowy dresses, they wouldn't be putting on a show.
