Here are 2 summer dresses/tunicas that I have already made earlier.
The green one has been made from an old curtain fabric. I love that fabric, it has my colors, but its flaw is that it gets very easily crinkled. I made the green dress from Yoshiko Tsukiori's lovely dress book (see e.g.: http://www.yesasia.com/global/adults-couture-free-to-coordinate-one-pieces-and-tunic-blouses-with/1010717844-0-0-0-en/info.html), but I shortened the model quite a lot. Tsukiori's book is beautiful and full of nice ideas. In addition, all those instructions are easy to follow and also relatively fast to make (e.g. few of the dresses need any zippers). I should test one day also some other models from Tsukiori's book, but until then...
This red dress has been made of Marimekko fabric (www.marimekko.fi). Marimekko is an old and nice Finnish fabric & design house which fabrics I fancy. The fabrics and their design clothes are full of 60's and 70's charm and have a good quality. The old, used Marimekko fabrics are the loveliest, but one has to pay sometimes crazy prices (as they do not make them anymore and Marimekko is huge in Finland)... Sometimes I make some findings from second hand shops, though. This red dress has been made from a new fabric, though. They sell some spare parts of fabrics quite cheap in Marimekko shops and I buy quite often these small pieces for my garments/projects. The instructions for this dress I spied from a Finnish basic sewing book called "Joka Tyypin Kaavakirja" (http://wsoy.fi/yk/products/show/28193). It was a success even though I do not have an overlock sewing machine and the fabric is kind of jersey.
If you like old Marimekko fabrics, check out also old Tampella or Finlayson fabrics.
I will put some pictures here later about my findings!