This dress is Ottobre 3-2012-18 Little Roses Version 2 and also MIL UFO #4. You can see version 1 here. It's such a nice little dress.
The first version of this dress has really grown on me and I already really like this second version. For this version I extended the tucks from 3 1/2 inches to 5 inches, though I'm really not sure that one length is any better than the other. The fabric is a really light weight cotton and perfect for this summer heat.