There are a wide range of sewing techniques regarding how to sew a centered zipper. But, this might be the simplest method for saving you from the frustration of to be able to rip it out and sew it over.
Here are some sewing tips to help you.
First of all, purchase a zipper longer than you really want to avoid stitching near the almost all the pull hook. You can use any of your longer zippers in your stash, too.
Preshrink the zipper. This helps prevent buckling later in the event the tape does contract.
Interface the garment zipper seam allowances with a lightweight fusible knit interfacing. Cut 2 strips of fusible knit interfacing about 1' wide on the straight of grain and fuse to the wrong side of the garment zipper area seam allowances.
Stitch your garment seam from the bottom to the mark where the bottom of the zipper will be.
Stop and drop the feed dog on your machine and stitch up and down in the same place a few stitches to sink a knot. Don't backstitch. You cannot backstitch straight furthermore causes bulk in the seam and never lays well.
Raise the feed dog and set your sewing machine stitch to an oversized baste stitch.
Continue stitching the seam to seo. Do not backstitch or develop a knot. Leave a prolonged tail of thread so it is actually going to easy to reduce.
Clip the first baste stitch in the evening knot for easy removal later.
Sandwich press the stitched seam. Press open the seam on the wrong side. Then press again on correct side. Use a press cloth to protect your fabric just to make sure.
Extra tip: Brown paper super market bags make good press cloths. In avoiding the printed area.
Now, wind a bobbin with 'Fusible Thread' and input it in your sewing machine.
Set your machine stitch length to be able to large basting stitch.
With the zipper face down at the sewing machine, use your regular presser foot and sew by the bottom of the zipper tape to the very top on both sides of the zip. The edge of the presser foot will be following the zipper teeth located on the wrong side with the zipper.
The 'Fusible Thread' basting will display on the right side of the zipper tape.
Place your garment with the zipper seam allowance side up on your pressing board.
With the zipper face down, put the bottom metal stop of the zipper at the bottom of the zipper opening and roll the teeth down along the stitching line up on the top. Press both sides for this tape fusing the tape to the seam allowances.
Note: If purchase 'Fusible Thread', use a double sided transparent basting tape or a strip of fusible an individual press and go through the zipper tape. Then 'glue or fuse' the zipper into the seam allowances.
Now the zipper is temporarily trapped in place.
Cut a strip of 1/2 inch wide paper medical tape or scotch tape the length of the zipper opening.
Draw a fine line exactly down center of the tape. There must be 1/4 inch on either side for the line.
On the right side of the garment, place this tape over the zipper seam line matching up the drawn line about the tape with the stitching line on seam.
Set your sewing machine for top the need for stitches. Put a zipper foot on handy.
Starting at the base of the zipper underneath the metal stop, stitch across the bottom, stop, pivot and continue stitching a maximum of the top for the zipper using the side of the tape as your strategies for stitch straight.
Reverse your zipper foot and stitch the other side across the bottom and up from a bottom to websites the same.
Now, your zipper is installed. That offer paper medical tape from the right side. Pull the basting thread out from the top. It should come out easily since you already clipped the thread next to the knot.