Catahedron Costume

Step 4 Attach binding, quilt along the color borders

For ease of construction the triangles will all be independently finished and then sewn together later.

Pin the binding strips to sandwich all three edges of each triangle. Fold the edge of the binding under at the corners to hide any unfinished edges. With your sewing machine set to very slow, carefully stitch the binding in place on all 9 edges. As you sew the binding you should aim your stitches at the very edge, no more than a millimeter from where the binding meets the quilt top.

I also chose to quilt another line a quarter inch out from the binding seam. This gave it a nice visual border and took care of holding the binding on at any of the points where I messed up on the initial seam. Specifically, it's easy to have stitches that are accurate on the top, but that miss the binding edge on the underside. The second line of stitches takes care of these cases and reinforces the final product.

While I was at it, I stitched across the seams where the black border met the large triangles, and along the color borders between the inner triangles. This sort of stitching is what gives it that classic quilted look, and also keeps each triangle together flat as it flexes. Try to use one long line for all your quilting stitches; you want as few loose thread ends as possible.