Apparel product development from tech packs to fit. Pattern, grading, sewing line balancing, quality, and compliance for brands and OEMs. This section explains practical decision criteria, typical test methods, and failure modes that matter in real production. Readers get checklists, calculation steps, and case examples connecting specifications to cost, reliability, and compliance. Links map core concepts to upstream inputs and downstream processes so choices remain consistent across sourcing, manufacturing, and end-use performance. Each article includes definitions, diagrams where helpful, and plain-language notes to help newcomers ramp quickly while giving experienced professionals the depth needed to troubleshoot and optimize. Standards references are cited with context, and whenever trade-offs exist, we make them explicit so you can defend decisions.
Builds a flat sheet, fitted sheet or pillowcase from its finished size outward — hems, seams, fitted pocket depth and tuck-under, then residual shrinkage — and divides the cut width into the usable fabric width to find how many pieces lie across the roll. Reports fabric per piece in metres and kilograms, what the leftover selvedge strip is costing, and how close the cut is to gaining a piece across.
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Turns a breakage rate per hundred thousand stitches into breaks per shift, re-threading downtime, the share of line capacity it consumes and its cost, then solves the rate a downtime target would require.
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Models relaxation as a fast and a slow viscoelastic component, returns the strain still in the cloth after a given dwell, the panel dimension error it will produce, the dwell a target residual actually needs and the roll buffer that dwell implies.
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Scales a reference blade life by fabric abrasiveness and ply height, returns the markers a blade survives between sharpenings, the sharpening stops and downtime a shift incurs, and the blade cost per marker and per year.
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Divides a fabric consignment into shade bands from its measured colour spread, allocates rolls and lays to each band, and reports the fabric stranded as sub-lay remnants at the end of every band – the hidden cost of a tight shade tolerance.
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Derives embroidery stitch count from design area, fill coverage and tatami fill geometry, adds the underlay, converts the total into top and bobbin thread length, and reports machine run time, pieces per hour across all heads and the backing area each piece consumes.
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Reverses garment wash shrinkage to size the raw pattern block: raw length and width needed to land on the finished measurements, the growth added in each direction, the fabric consumption uplift and the spread caused by shrinkage variability.
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Adds up garment thread consumption across the ISO 4915 stitch classes actually used — lockstitch, chainstitch, overedge and safety stitch — each at its own consumption factor, with wastage allowance and thread weight.
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Scales a base-size tech pack measurement across a full size run from the grade rule, returning the top and bottom size measurements, the span of the run, the tolerance band and how far adjacent sizes overlap within tolerance.
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Calculates open-to-buy for a buying period from planned sales, markdowns, opening and closing stock and outstanding orders, alongside inventory turn, weeks of supply and gross margin return on inventory investment.
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