If only the edge of an iron-on patch has lifted and the fabric beneath is firm, sewing the edge down can be an option. Check the garment label and the patch instructions first. If you cannot establish that the fabric tolerates reheating, avoid trying to reactivate the glue.
Find out what is lifting
Look at the underside of the lifted flap. A flat patch edge peeling away from clean, firm cloth is different from a patch bringing torn fibres with it. Inspect the whole edge rather than pushing the first corner down. If the patch is rigid, puckered, stained with adhesive or moving over a much larger hole, covering the corner with stitches may conceal the problem without fixing it.
Decide between stitching and replacement
On a sound, flexible patch with a small lifted edge, test whether a fine needle can pass through the margin by hand without force. If it can, match the thread and hold the flap flat with a clip. Sew the patch edge to sound garment cloth in short, relaxed stitches. Keep the other side of the leg clear. If the adhesive is hard or the needle bends, stop; sewing through a thick, sticky layer is difficult to control.
Treat an unknown adhesive cautiously
Avoid peeling the whole patch off when it pulls garment fibres up, and avoid using solvents on an unknown uniform fabric. If the original product is identifiable and gives instructions for reattachment, follow those only within the garment’s care limits. When the two instructions conflict, ask an alterations service about a sewn replacement. Do not assume glue residue will wash away.
Check the repaired edge when the leg moves
Bend the knee and run a finger around the patch. A good edge stays flat and the surrounding cloth is able to move. After washing according to both labels, check for fresh lifting before the uniform goes back into use. If the garment fabric is tearing around the patch, reassess the size of the worn area before choosing a replacement.
References
- ACCC Product Safety — care labelling on clothing and textiles
- The Hills Shire Council — clothing and textile repair demonstrations