What documents should I prepare before changing clothing manufacturers?

Before changing clothing manufacturers, a brand should prepare an approved physical sample, previous bulk sample, updated tech pack, measurement chart, POM diagrams, grading rules, fabric swatches, color standards, trim card, logo files, label instructions, packaging requirements, and previous production issue notes. These documents help the new manufacturer understand what must stay the same and where improvements are needed. A physical sample is especially important because photos cannot fully show garment balance, fabric hand feel, rib tension, stitching quality, lining structure, or wash result. The more complete the transfer package is, the less the factory has to guess during sampling and bulk production.