I found this technique in Australian Stitches magazine ages ago and thought I would try it.
In this picture the twill (fabric with what looks like slight diagonal lines) is the shell fabric and the fabric you can see most of is the interlining.
The edges are self-bound using the interlining. Cut the interlining exactly 12mm wider along each vertical seam. Then the interlining and shell fabric are sew right sides together along the vertical seams with a 5mm hem. Turn it right side out press the interlining around the shell fabric. Top stitch.
This was so difficult to do really accurately especially as the shell fabric I used was really unstable. But it does look really neat.