Freeze one responsible pattern record
ASTM D6193 and ISO 4916 classify many stitch and seam constructions; they do not establish one universal allowance. Record the exact pattern piece, size, view, revision, construction, material state and responsible reviewer before entering dimensions.
One worksheet = one rectangular piece, orientation, stitch-line basis and approved edge map
Map every straight edge independently
Enter left, right, top and bottom offsets exactly as the responsible record defines them. Zero is valid. The arithmetic never assumes that opposite edges are equal or that a named garment or quilting convention applies.
Cut width = stitch-line width + left offset + right offset; cut length = stitch-line length + top offset + bottom offset
Keep geometry and construction boundaries visible
A constant offset around curves changes geometry and requires source-owned corner, notch, clipping, trimming and match-point treatment. Turn-of-cloth, thickness, grain, nap, print direction, grading, ease and fit also remain outside the rectangular model.
Rectangular straight-span result only; no curve, corner, notch or transformation inference
Reconcile instead of approving
Compare the reproduced dimensions with a completed responsible record and, when available, one complete same-basis independent record. Signed, absolute and relative differences expose transcription mismatches but do not define tolerance or approve a cut.
Difference = recorded cut dimension − reproduced cut dimension
