A facing is a shaped piece that finishes a neckline from the inside. Whether it stays inside depends almost entirely on clipping and understitching.
The order.
One. Staystitch the garment neckline before you handle it. A neck curve is close to the bias and it stretches simply from being picked up.
Two. Interface the facing pieces. A light fusible is usually right — enough to stop them collapsing, not enough to make a collar.
Three. Join the facing pieces at the shoulders and press those seams open.
Four. Finish the outer edge of the facing — overlock, zigzag or turn and stitch. Do it now, while it is flat.
Five. Pin the facing to the neckline, right sides together, matching shoulder seams and centre front. Sew.
Six. Trim and grade the seam allowance, and clip into the curve at short intervals, almost to the stitching. Clipping is what lets the seam spread when it turns; without it the neckline pulls tight and stands away.
Seven. Understitch. Press the seam allowances towards the facing and stitch through the facing and the allowances, close to the seam. This is what stops the facing rolling to the outside, and it is not optional.
Eight. Turn, roll the seam slightly to the inside, and press.
Nine. Anchor the facing at the shoulder seams with a few hand stitches or stitch in the ditch, so it stays put in wear.
Test the neckline fits over your head before finishing it.
Questions people actually ask
My facing keeps flipping out.
It was not understitched, or not anchored at the shoulders. Understitching alone fixes most cases.
Should I use a facing or a binding?
A facing gives a clean invisible finish and needs interfacing. A bias binding is quicker, less bulky, and reads as a design feature.
Last reviewed 2026-08-11