Case Study: Custom Open-End Zipper for a School Uniform Buyer in Spain

Open-End Zipper for a School Uniform Buyer in Spain

A School Uniform Buyer approached us with a open-end zipper requirement for the Spain market. The brief was specific: a defined look, a hard launch date and a unit cost that had to survive freight and duty. This case study records what was specified, what went wrong in sampling and how the bulk order was delivered.

The challenge

• A zipper puller that broke under pull test at the warehouse
• A trim that passed sampling but failed in-line because it was never cycle tested
• Reorders that quietly changed supplier and changed the hand feel

What we specified

How it was resolved

1. We rebuilt the specification around Cotton and locked the tolerance before bulk.
2. The finish was moved to Rose Gold Plating after strike-off tests showed better durability.
3. A pre-production sample was approved and retained as the golden reference.
4. Production ran with in-line inspection and a mid-run photo report.
5. Cartons were packed to the client's own barcode and ratio specification.

Result

• 5,000 pieces delivered inside the 4-week window.
• Unit cost held within 3.0% of the original quotation.
• Inspection-related rejection stayed under 0.5%.
• The specification is now on file, so reorders reproduce the approved sample.

What we would repeat

Lock the material standard before sampling. Once the base changes, every downstream approval has to be redone and the calendar slips.

Planning something similar?

Share the programme details and we will propose two alternatives — one optimised for unit cost, one for lead time — and let you choose.