need opinion on flower girl dress decision

I have a junior bridesmaid (who is 11) and a flowergirl who is 7. However, they are only slightly different sizes. the junior bridesmaid is only two inches taller. my junior bridesmaid is having her gown made in the same material as the bridesmaids so now i am wondering what to do about the flower girl:
white with sash to match bridesmaids?
or white on the top of the dress and skirt to match bridesmaids?
i am wondering if it will look strange to have her in white when she is almost the same size as the junior bridesmaid (who is very small for her age).
anyone have a similar situation? if so, do you have pics?
THANKS

I have a similar situation. My flower girl will be 4 and my jr, bridesmaid will be 8. But they are both still little girls. My bridal party is wearing red with yellow flowers so I am going to put both of the young ones in yellow. I think red is a little to vixen for them being so young and yellow is the highlight color. I hope it will look okay