A missing pull tab is an easy problem to mistake for a broken zip. If the slider still joins the teeth and stays closed, the pull may be all you need. If the teeth separate behind the slider, or the tape and teeth are damaged, fitting a new pull will not restore the closure.
Look at four parts with the garment laid flat
The pull is the handle. The slider is the body that travels along the zip. The teeth or coil are the parts that mesh, and the tape holds them to the garment. On a separating jacket zip, also check that the insertion pin and box meet cleanly. Look for a caught lining or thread before moving the slider; forcing it over a snag can damage an otherwise usable zip.
Match the symptom to the next action
Pull missing, zip still closes: if the slider has a sound attachment designed for a replaceable pull, use a compatible replacement and check that any locking mechanism still works. An integral pull may require a replacement slider. Teeth open behind the slider: examine the teeth first. With sound teeth and tape, a worn slider is one possibility. Ask about the correct size and type before buying one. Missing teeth, torn tape or a broken separating pin: ask whether the zip needs replacing; the slider alone cannot replace the damaged part.
Test before wearing the uniform
Lay the garment flat so both sides of the zip are level. Run it through its travel gently and inspect the line it leaves behind. A zip that works when flat but opens on the wearer may also be under load from the fit. A slider that binds or opens repeatedly needs assessment rather than repeated force or squeezing with pliers.
Take useful information to an alterations service
Bring the garment with the zip open if possible. Note where it sticks or separates, whether it has metal teeth, moulded teeth or a coil, and whether it separates at the base. That description helps the repairer distinguish a part replacement from a job that needs unpicking and sewing in a whole zip.
References
- Patagonia and iFixit — zip parts and repair guides
- YKK — zip faults and repair questions (manufacturer guidance, in Japanese)
- The Hills Shire Council — clothing and textile repair demonstrations