Replacing a jacket zipper involves removing the old zipper tape and sewing a compatible new closure into the garment. It is a larger job than changing a slider. First check whether the teeth, tape or lower box are damaged; a sound zipper chain may need a smaller repair.
Record the original construction
Photograph the closed jacket and its inside before unpicking. Note where the zipper sits relative to the hem, collar, storm flap and lining. Measure the working zipper length between its stops and record whether it separates, has one or two sliders, and uses coil, molded or metal teeth.
Choose a replacement suited to the fabric weight and opening direction. Matching length alone is insufficient. A lightweight dress zipper is not a substitute for a separating jacket closure, and a standard zipper does not reproduce a waterproof assembly.
Baste before permanent stitching
Open the stitching carefully with a seam ripper, protecting both fabric and lining. Retain usable seam allowances. Secure the first replacement tape in the original position, then close the zipper and mark matching collar, pocket and hem landmarks on the other side.
Baste both sides and try the jacket on. Check that the fronts meet evenly and that the zipper does not wave or drag the lining into the slider. Only then stitch with a zipper foot and thread and needle appropriate for the garment.
When should a repairer do it?
Choose professional repair for leather, bonded fronts, taped seams, delicate insulation or complicated storm flaps. Replacing the closure can interrupt weather protection or damage expensive materials. Ask the repairer what finish, alignment and protection the quote includes, and inspect the completed jacket open and closed.
Related reading
How to document jacket sample approval. For another useful reference, see Agreeing jacket measurement methods and tolerances.
