A standard curtain rod requires an inch and a half casing opening.
Sew a line of straight top stitching 1 1/2" from the stitching at the bottom of the header. This is an excellent time to set a seam guide so that all of the stitching is the same distance. The stitching needs to be uniform on each panel for the curtains to hang evenly.
How to Sew Simple Custom Curtains
By Debbie Colgrove, About.com Guide
Explore Sewing
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