How to End a French Seam Above a Vent
Make a smooth transition to a vent
When you’re working with lightweight fabrics, a French seam is often the finish of choice. But if there’s a side-seam vent, you need a way to neatly end the seam and create a sturdy, good-looking treatment at the top of the vent. I’ll show you a clever method. Try it with shirt-weight linen, cotton, and sheer fabrics—the very textiles that call for a light, clean finish. Avoid applying it to loose or open weaves, however: You’ll end up with a hole at the point of transition. The process shown is for a pattern with 5/8-inch-wide seam allowances, but you can adapt it as desired for wider allowances in the vent area.
1. Thread-trace and sew the seam. Place the layers with wrong sides together. On the top layer, thread-trace the point where the seam ends and the vent begins, with crossed horizontal and vertical lines.…
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