I have a MOH that's 5'6", size 26, a bridesmaid that's around 5 ft even and barrel shaped, and another bridesmaid that's 5'4"-ish that's a size 22, though her boobs fit better in a size 24 dress. We ended up going with this dress in Horizon:
It flaters EVERYONE!!! And it's only $100! ($80 if you bought your wedding dress there) It's so flowy and soft and amazing!
I was so worried about finding a single dress for everyone in the material I wanted and color I wanted. I was very impressed with how well this dress worked on my larger bridal party!