Jen from Grainline Studio shares a tutorial showing how you can finish all your seams neatly with French seams. A French seam encloses the seam allowance so there are no raw edges left to fray. Her tutorial includes how to make this finish on a straight side seam, and also how to finish an armhole seam with the French seam. Go to Grainline Studio for the tute.
[photo from Grainline Studio]