Ken writes to ask: I know you can slim a shirt down by either taking it in at the sides or adding darts to the back, but is one better than the other in certain cases? When should you add darts to the back or shirts, and when should you avoid them?

Ken writes to ask: I know you can slim a shirt down by either taking it in at the sides or adding darts to the back, but is one better than the other in certain cases? When should you add darts to the back or shirts, and when should you avoid them?