We recommend understitching to ensure a better finish when we want no seam to be visible on the right side of the garment, where the facings are sewn to the other pieces (notched lapel collar, armholes on a sleeveless top, neckline etc).
The understitch is made after the facing is sewn with the matching piece. The seam allowance of this join is stitched with the facing, parallel to the joining seam, from about 2mm/0.08” from this seam, leaving the garment in itself separate from the understitching.
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