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How these numbers are worked out

Sewly drafts the pattern at each standard size with its drafting engine, seam allowances included (1.5 cm / 5/8 in on woven fabric and 1 cm / 3/8 in on knits by default). It then lays the pieces on fabric folded selvedge to selvedge at each width, adds 8 % plus 10 cm for squaring the ends and shrinkage, and rounds up to the next 10 cm. Large plain rectangles such as waistbands are counted. The same inputs give the same figure every time: nothing here is an AI estimate. Pieces are placed as rectangles around their outlines, so the figures are cautious: an experienced cutter can sometimes nest tighter.