Adjust the sleeve cap height and its front/back widths. Match each cap seam to its armhole plus the requested ease, within 0.4 cm. Keep the bicep width in range. Then pair cap front → armhole front and cap back → armhole back, both upright, and walk the seams.
Teal: front cap. Copper: back cap. Dashed line: bicep. The textured shape is the sleeve pattern, not a finished garment simulation.
The seam-walking desk
Pair the sewing edges
Select a cap edge, then its matching armhole. The source seam-selection state machine commits the pair. Reversed orientation twists the assembly.
Select a cap edge.