Fold the welt piece in two with wrong sides together. Baste it at 1,5 cm (5/8") from the outer edge.
Baste around the pocket opening.
Place the welt over the bottom line of the pocket opening, matching the basted lines. The folded edge is facing down.
Stitch over the basted line, starting and ending about 1,5 cm (5/8") from the edges.
Pin the pocket (cut in lining fabric) and the pocket facing with the right sides together. Stitch.
Press the seam allowances open. Baste at 1,5 cm (5/8") from the upper edge.
With right side facing down (and the pocket upside down), pin the pocket facing to the pocket opening matching the basted lines.
Stitch over the basted line, starting and ending 1,5 cm (5/8") from the edges.
Cut the pocket opening, cutting diagonally into the corner in a V shape the closest possible to the stitches. Be careful and remove the seam allowances from the welt and pocket facing from the other side before cutting.
Pass the welt and the pocket facing throught the opening.
Fold the little triangles like in the picture and press lightly to keep in place.
Take the other pocket piece in lining fabric and place it over the welt pocket, matching the outer edge. Pin together and stitch at 1,5 cm (5/8") (it's easier if you use a zipper foot).
Place the welt first and then the facing over it. Press lightly. Pin the pocket edges together.
Stitch the little triangle to the pocket welt and facing, the closest possible to the triangle base, using a short stitch length.
Now stitch the pocket edges together
Here is the welt pocket from the right side: pretty, no? Remove the basting, make the second pocket and you're done!