Taunton's Threads - For people who love to sew
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From the pages of Threads magazine Line and Underline in One Step A speedy assembly method puts together all garment layers at once, and conceals all the seams Like most sewers, I occasionally find myself completing a project at the eleventh hour. On one such occasion, I was faced with finishing a jacket that needed both an underlining for support, and a separate lining for a neat interior. Instead of panicking, I came up with this solution, which omits the lining and uses the underlining, applied in an unconventional way, to hide the seam allowances. It’s a very straightforward method that’s well-suited to a wide range of garment types (including multipanel jackets, skirts, and pants), works with most lightweight to medium-weight fabrics, and requires no special pattern pieces. And because you don’t construct the lining as a separate unit, you save lots of time. Even with a bit of topstitching to hold the underlining in place, this technique cuts construction steps without compromising the durability or appearance of the finished garment.
Pair the underlining to the fashion fabric When choosing an underlining fabric, take into consideration how much support, slipperiness, opacity, or warmth the inner fabric must provide. Fabrics I’ve used successfully include traditional, silky linings, organza, batiste, flannel, and lightweight polar fleece. For fashion fabric, I avoid heavy or lofty types, which create undesirable bulk where the seam allowances are pressed to one side. I’ve also made fully reversible garments by using two equal-weight fabrics for the outer shell and the underlining. Revise the garment construction—slightly My underlining technique finishes most interior seams as you sew, but because there is no separate lining to attach facings to, you must clean-finish facing edges, using your preferred method. I also clean-finish the armscye and sleeve cap seam allowances before setting in the sleeve. Collars and cuffs should be interfaced as usual. Consider using a slightly lighter interfacing than normal for facings, since the underlining on the body of the garment adds a layer of fabric in faced areas. Don’t hesitate to interface placket edges if necessary, or to add a sleeve heading. Once you’ve underlined the garment body following the directions below, set in the sleeves, and attach any collars, facings, or cuffs, then sew the hems. Topstitch to anchor the underlining As you can see in the photos below, I topstitch parallel to all the seams to anchor the underlining and seam allowances. This step is critical, as it provides stability; it also gives the appearance of flat-felled seams. If you don’t like topstitching, edgestitch very close to the seam, using matching thread.
Prepare pattern pieces for sewing. Begin with a pattern that has been altered to fit; with this technique, it’s difficult to make fit adjustments during the sewing process. Cut the fashion fabric and underlining fabric, using the major pattern pieces for both. You don’t need underlining fabric for facings, collars, pockets, or cuffs. Interface the fashion fabric as needed, and complete any surface details such as darts, pockets, or embellishments before lining. Start at the center back seam. Stack the back pieces of fashion fabric, right sides together, with center back seam allowances aligned. Do the same with the underlining pieces, then lay these on top of the fashion fabric. Pin, then sew all four layers together along the center back seamline. Trim all the seam allowances to a scant 1/4 inch and press them flat, as sewn. Open out the fashion fabric and press the seam allowances to one side. Topstitch the underlining in position. Open out the underlining fabric so that one layer covers the seam allowances, and press in place. From the garment right side, topstitch the underlining to secure it to the fashion fabric, and to enclose and cover the center back seam allowances. Complete the remaining seams, working from the center back toward the front. Sew subsequent seams in the same way, in the order shown below. Then sew the shoulder seams conventionally and clean- finish the seam allowances. 
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