Edexcel GCSE Design and Technology · 1DT0
Specification 6.6.3 · Paper 1
Revise: Techniques for Quantity ProductionA reference line provides a consistent guide. A centre line can be used to position features equally on either side; a stitching line guides a seam. On woven fabric, the selvedge—the finished edge along the fabric’s length—provides a reference for aligning a pattern’s grain-line arrow.