Draft smooth curves and consistent seam allowances with this Curved Sewing Seam Allowance Ruler set, designed for precision and ease. Add or reduce seam allowances in 4 seam allowance widths—3/8”, 1/2”, 5/8”, and 1.5 cm—this ruler is ideal for necklines, armholes, hips, waistlines, and other curved pattern areas where accuracy matters most.

Made for garment sewists, pattern makers, and designers, this versatile ruler combines clear markings with a fluid shape to help you trace, add, or adjust seam allowances quickly and confidently. A must-have drafting tool for clean lines, professional results, and frustration-free pattern work.

• 2-piece curved ruler set for versatile pattern drafting

• Smooth curved design ideal for necklines, armholes, and contoured seams

•  Clear, easy-to-read grid and measurement markings

• Perfect for pattern drafting, garment alterations, and design work

• Lightweight, durable tool for everyday sewing and pattern making