Please help, oh wise BBB shoppers! I need to find flower girl dresses for my DDs. I am not much of a shopper -- my DDs pretty much live in clothes from Kohls and I don't even know where/what stores to look for what I'm looking for! I would appreciate any suggestions of stores to check (online only is totally fine) or even specific dress suggestions. Here's the criteria I'm working with:

*Bride is wearing bright candy pink -- shiny satin skirt w/ a tulle skirt over it and a white lace top
*Bridesmaids are wearing bright pink, floor-length dresses
*Groom and groomsmen are wearing gray suits with pink ties
*Criteria bride has given me for the flower girl dresses is "anything gray, silver, or pink, just not white" -- she doesn't have a strong preference on length or material/style, etc. It doesn't have to be crazy fancy, but the rest of the wedding party is dressy enough that it can't just be a jersey dress or something super casual.
*Additional factor - my DDs are 9 and 6 -- the goal is that they're in the same dress, so I'm trying to find something that isn't too babyish for DD1, nor too mature for DD2 (DD1 usually wears an 8 or 10, DD2 usually wears a 6x, but we maaaay be able to make a 7 work, as often the size cut-off between dresses is right at that point)

My DDs would probably prefer pink for the color, but I'm a bit concerned that with the bridesmaid dresses and the bride in pink, an additional shade of pink will look weird, so I'm wondering if I should go with silver or gray. I know the bride spent quite awhile reviewing swatches with picking her dress and the bridesmaid dresses to ensure she liked the look of the pinks together (but maybe I'm overthinking as the flower girls obviously have a much smaller role?)

I'm feeling very lost and have visited waaaaay too many sites today and am coming up with nothing......any form of direction or ideas would be very appreciated! TIA!!!!