Chadwicks/Jessica London has cute red and white dresses. I didn't check out green, lol.
www.chadwicks.com
Last year, my chapter wore red dresses of all diff types. They got positive responses back.
I went ahead and ordered a new white dress last week. It has a white sweater with it, but I also bought a black/white sweater at Kohl's as an extra incentive to wear it, lol.
As they said at ACT in Charlotte, go ahead and order a white dress during the summer when they are easier to find..cause you aren't gonna find them too plentiful in Fall/Winter selections.