How far is a fixed 0.80 marker efficiency from a nested coat, and what does the difference do to the cost model?
research/garment-nestcost
Nesting a stylised coat's 10 shell and 5 lining pieces with a 1.5 cm seam allowance gives marker efficiencies of 0.68–0.73 (shell) and 0.59–0.68 (lining) at three cloth widths, below the fixed 0.80 in garment-teardown; its trench FOB moves +9% to +15% at the teardown's own areas. Stylised, preliminary.
What it found
Follow-up to the nesting and cost-teardown projects (stylised, preliminary). A coat drawn as 10 shell and 5 lining polygons, grown by a 1.5 cm seam allowance and nested by annealing at cloth widths of 110, 140 and 150 cm, gives marker efficiencies of 0.68–0.73 for the shell and 0.59–0.68 for the lining, against the fixed 0.80 assumed earlier (0.77–0.82 without allowance). Transplanted into the teardown trench model, the efficiency alone raises factory cost by about $20–30; the larger uncertainty is the pattern area, which these invented pieces do not settle. One ply, one size, my own shapes, no exact reference.
A figure from its own output
Paper, code and results
More in Engineered clothing
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- How far is the repository's two-node thermal model from an open-source implementation of the Gagge model?Cross-checks
garment-thermal's two-node model againstpythermalcomfortover 108 conditions: core temperature within 0.25 °C, skin temperature mean 0.6 °C (up to 2.1 °C) apart; a comparison of implementations, not of people. - Which design choices explain the gap between the repository's two-node model and an open-source Gagge implementation?Switches nine design choices one at a time between
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garment-thermal's fabric optics (infrared transmittance, emissivity, solar absorptance) to the switchable two-node model and re-runs the comparisons underpythermalcomfort's choices: property rankings agree in all four scenarios, sizes within 3% at 28 °C but up to ~2× apart in cool air and in sun; a comparison of implementations, not of people.
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Produced with AI assistance (Claude). Results are from the code in this repository and are simulated or stylised unless the abstract says otherwise; nothing here implies affiliation with or endorsement by any lab, researcher or company cited. MIT licensed.