Here is one of my favorite Edwardian dresses in my collection, mostly because it's a magenta pink! Also, it accentuates the waist line.
A pretty idea for an Edwardian or Downton Abbey inspired wedding would be to take several white cotton Edwardian dresses and dye them different colors for the bridesmaids. The bride could still wear the traditional white. You could also do this for an old fashioned family picture as well.