Flower dress trends are certainly strongly influenced by the wedding dresses trend. Ideally, brides are looking for the best style match to her gown. In reality, such perfect matches are hard to find (unless flower girl and wedding dresses are ordered from the same designer, however there only a few providing such option).
Some brides do not attempt achieving any matching to their gowns at all, but try to find a flower girl outfit that would suit the wedding style or the colour scheme...
Let's look at the current flower girl dress trends:
Ivory + Subtle Additional Colour Matching the Wedding Theme & Style