Old Navy's 100% cotton cross front sundress is $24.50. Surely this will go on promo. It comes in solid colors in addition to patterns.
Here is the blue stripe pattern.
A purple stripe pattern, tried on for the blog only. Size small.
I am not a fan of the dress. If you have larger girls, you might need to go up a size. I recall the dress being a little difficult to get into for some reason. The skirt is too billowy, but this may hide some parts that you don't want to share. Interestingly, the tag on the dress said $19.50, so I don't know what's up w/the online price of $24.50.
Old Navy doin' it for you?