Mistakes & fixes

When top and bottom seam layers creep apart, unequal feed pressure or a fabric mismatch is usually to blame. Use a walking foot, hand-baste slippery layers together, or ease the top layer as you sew.

Understitching that wanders away from the seamline, leaving the facing visible from outside, comes from sewing too fast or not keeping seam allowances pressed toward the facing. Slow down and hold allowances flat as you stitch.