BACK STITCHING.
The back stitch is made by placing the needle back in the last stitch, bringing it out once the length of the last stitch, then placing the needle back into last stitch and so on, being careful not to draw the thread too tight as to have a drawing appearance, make the stitches follow each other without leaving a space between. Back stitching is used in places where much strain is on the seam.
Bias hems, such as sleeve head lining, etc.
All bias hems and curved edges, should have the folds basted in.