The mattress stitch is a common finishing technique for sewing seems. It gives a great finishing look as though the stitches are melting together.
Following is a simple process for working mattress stitch for side seams that you want to lie in a flat way with no bulkiness on the wrong side.
You work the mattress stitch in a crisscross method, consistently insert your tapestry needle from front to back between the first ans second stitch from the edge.
