In this example, I’m using the type of boning that comes in the fabric casing. I am applying the boning to the lining of the bodice, so the casing seams are visible only inside the garment, not from the outside.

First, you’ll construct the bodice lining. Sew all princess seams or darts, and sew side seams of bodice front and back. Leave the bodice open at the closure seam. In this case, the closure is a left side zipper. Press darts and press seam allowances open. Trim seam allowances to ¼” (6mm). Trimming (page link) is optional, but it helps to reduce bulk, if necessary.

If the pattern calls for boning, it will indicate which seams require boning. If not, decide where you want to add the boning. At minimum, you’ll want to add a piece of boning to each side seam. Those two pieces will add structure and help keep your dress up. Depending on the design, you may want to add boning to the vertical seams as well, along the vertical darts at the back or along center front or back. The more boning you add, the more structured your bodice will be.

Measure the seams where you want to add the boning, and cut the boning to match the seam lines. You’ll need one piece of boning in its casing for each seam.

Take the boning out of its casings. You’ll have curly plastic strips. To straighten out the boning pieces, fill a shallow dish with boiling water and drop the plastic pieces into the water. Leave the boning in the hot water for five to ten minutes, using a mug or dish to hold the pieces under water. Take the pieces out and press them flat under something heavy while they cool off. (If you’re not able to soften the boning in hot water, alternate the direction of the curl as you insert each piece into its casing so that they don’t curve the same way. Over time they should straighten out.)

Center the casings along the seam lines or dart lines, and pin to the bodice. Pin all of the casings in place. Edgestitch on either side of the casing, through the original casing stitch lines, with your sewing machine.

Before inserting the boning back into the casing, trim ¾” (1.9cm) off each end. You do this is to make sure you don’t stitch through the boning when you sew your top and bottom seam allowances. Cut the ends in a slight curve to remove the corners. With a nail file, file the ends into a slight arc to smooth out any sharp points. Alternately you can melt the ends carefully with a match or lighter. The ends will form a hard knob without any sharp edges.

Insert the boning into the casings, and check to make sure each piece ends at least 5⁄8″ (1.5cm) from the raw edge. Sew across each of the casing openings to keep the boning inside its casing.

Voila! Your boned bodice is complete.

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