How to Make Double Welting Trim

Measure the edge of the furniture piece where you intend to apply double welting trim. Using a yardstick and scissors, cut fabric strips that are four inches wide, enough to make the welt, plus a few more inches. Cut the ends of the fabric strips on the bias (45-degrees). Sew the strips end-to-end on the bias to make one continuous strip of fabric. Joining the strips on the bias will eliminate bulky seams and lumps in the finished welt cord. Cut two pieces of welt cord to the same length as the joined fabric strips.

Lay the fabric right-side-down on a flat surface. Lay the welt cord in the center of the fabric strip, parallel to the edges of the strip. Fold the fabric in half longitudinally over the cord. The open side of the folded fabric is on the left; the fold is on the right.

Raise the presser foot and needle on the sewing machine. Push the welt cord with your fingers so it is positioned tightly against the center fold of the fabric. Lower the needle so the right side of the needle presses the welt cord firmly into the fold. Drop the presser foot. Sew a continuous seam along the entire length of the welt cord. Maintain lateral pressure between the right side of the needle and the enclosed welt cord as you sew. Trim loose threads and excess welt cord.

Open the fabric strip with the fold to the right. Insert the second welt cord between the layers of fabric. Press it tightly against the seam. Fold the fabric over the second welt cord. Drop the presser foot. Sew a continuous seam along the entire length of the second welt cord. Maintain lateral pressure between the right side of the needle and the enclosed welt cord as you sew. Trim loose threads and excess welt cord. Do not trim excess fabric from the finished welt.