Sew down the length of the seam by inserting the needle at the outermost edge of the visible fabric folds - alternating to the parallel side and back to the starting side.

Each stitch should be approx. 1/4 inches or less apart from the prior stitch when alternating sides.

This is known as a slip stitch - a ladder/ zigzag pattern that connects the two sides of fabric giving the illusion of an "invisible stitch."

Remove the pins as your stitch approaches them, making sure to keep the fabric folded in on itself.