With Spring here and Summer on it's way, there isn't a better time to start looking for Summer dresses. We've found quite a few this year mostly at Target in the Girls section and their sizes run from xs:4/5 to XL:14/16. The long ones are: "Inca Red" "Deep Navy" "Fudge Solid" and "Green Plaid" (which is actually blue and purple) and these will show up if you click on the Target link above. 
My parents went out and bought all 5 of us girls these matching dresses and they're a lot of fun to wear!
OldNavy has 1 long dress in the womens section and they sell it in Aqua Blue and Black.
Please let me know if this is helpful! :)
~Hoping you all have a Blessed spring!
(I'll have more pictures up soon!)
