Early in the summer, I sewed several Willow Tanks, from Grainline Studio. They are part of this year's summer uniform. I pretty much wear one every day. More recently, I followed these instructions (more or less) from Fancy Tiger Crafts for modifying the tank into a gathered dress.
The fabric is a yarn-dyed linen. I cut out the pieces flat, not on the fold, to be sure to get the check pattern to match at the seams and darts. The only other change I made was to make patch pockets sewn into the side seams, instead of inseam pockets. Bring on the dog days of summer!