In one session, fuse interfacing to the jacket front, facing, back, collar, undercollar, and sleeves. Grouping the work is an efficient way to prepare major jacket sections for the steps that follow. After fusing, let the sections cool and dry on a flat surface. Wait overnight before handling medium- to heavyweight woolens and textured tweeds. Wait one or two hours for fabrics of lighter weight.
Fusible interfacing is cut on the seamline rather than the cutting line in all places except at the armhole. Stitch interfacing in the seam at the armhole to support the sleeve. For lightweight fabrics, use the cutting line at the hem instead of the hem foldline.