This T-shirt is a little on the long side but I wouldn't exactly call it a tunic. Depending on your chosen fabric and whether or not you want to add a little length this could easily work as a tunic if that floats your boat.
Pattern Drafting Hints:
This pattern is a pretty straight forward ladies T-shirt pattern. Its distinguishing features are really its longer length and flared long sleeves. I enlarged this pattern with my usual measurements and sewed it without adding seam allowances for a close fit. If I wanted an even longer length I would just add it to the bottom edge.
Both of these shirts are made from Rayon/Lycra blend fabrics. The striped fabric doesn't have quite as much stretch but both fabrics have a nice drape to them. The striped shirt is finished at the neck with my favorite piped elastic. The solid color shirt is just finished with clear elastic serged at the edge and then turned and topstitched.
The striped shirt is the pattern made up with just a few changes plus personal alterations. I reduced the width of the bell sleeves and the width of the neckline. I have trouble eating gracefully with really dangly sleeves. I've also noticed that quite a few of my last Lutterloh patterns had rather open necklines.
I bought a shirt at Macy's after Christmas that had an interesting high/low hemline. When I was folding it to put away I noticed that it really had a basic T-shirt shape with just a slightly curved back bodice. The real shape comes from a wide, triangle shaped godet inserted into the center back seam.