Here are the instructions I wrote:
So here's what you need to create this tunic, it only took a couple hours and can be dressed up and is still comfy enough to sit around the house. For my fabric I used a remnant I had bought from a fabric store, it's a silk crepe so it would be really flowy. I only needed about a yard.
To start I first measured how big I wanted the tunic, I wanted it about to my elbows and at least 27" long (the zippers length), after I cut out two rectangles which with my measurements were 40 inches wide by 30 inches long. I cut one rectangle in half for the back and sewed on the zipper. Then I faced the two rectangles face to face and sewed the top leaving about 12 inches in the middle open for my head (important). Then sewed the sides leaving again about 12 inches open at the top for my arms (that's important too!). After that I turned the shirt right side out and figured out where I wanted my waist and cut slits on the front and back for a belt or sash... And voila! You have a homemade Grecian tunic. I hope my instructions were understandable :D