A facing gives a clean, invisible finish on a shaped neckline in a structured woven fabric; bias binding is the lightest and quickest finish and suits knits, fine fabrics, curved edges and anything where a facing would show through; a lining finishes the neckline and the armholes in one operation and hides every seam allowance, which makes it the natural choice for a sleeveless dress or top and for sheer fabric. Choose by the weight of the fabric, the shape of the neckline, and whether the armholes need finishing too.
| Feature | Facing | Bias binding | Lining |
|---|---|---|---|
| Seen from outside | Nothing, or a line of topstitching | A narrow band, or nothing if turned to the inside | Nothing |
| Best fabric weight | Medium and heavy wovens | Light wovens and knits | Light to medium, with a lighter lining fabric |
| Neckline shapes | Any, including square, V and keyhole | Round, scoop, gentle V; corners need mitres | Any |
| Finishes the armholes too | Separate armhole facings | Separate strips | Yes, in the same step |
| Bulk | Two extra layers plus interfacing at the edge | One or two layers of light fabric | One full extra layer |
| Tendency to flip out | Yes, unless understitched and tacked | Low | Low if understitched |
| Shows through sheer fabric | Yes, as a shadow | A narrow line | No, it is the opaque layer |
| Time | Medium | Quick | Longest, a second garment |
| Can be cut on | Yes, a cut-on facing at a straight edge | No | No |
What is the difference between a facing, bias binding and a lining?
A facing is a piece of the garment fabric, 5 to 7 cm (2 to 2 3/4 in) wide, cut to the same shape as the neckline, usually interfaced. It is sewn to the neckline right sides together, turned to the inside and stays there, so the edge of the neckline is the garment fabric folded over itself.
Bias binding is a strip of fabric cut on the diagonal, at 45° to the grain, so it stretches around curves. It is sewn to the neckline edge and either wrapped around it, so a narrow band shows on the outside, or turned entirely to the inside and stitched down, which is called a bias facing. The strip can be the garment fabric, a contrast, or a bought binding.
A lining is a second garment, in a lighter fabric, sewn to the outer garment at the neckline and armholes and hanging free inside it. It finishes the edges by enclosing them between the two layers. Lined vs unlined garments looks at the whole garment; this article is about the neckline.
When is a facing the right choice?
When the fabric has body and the neckline has a shape to hold. A square neckline, a deep V, a keyhole or a sweetheart needs the corners and points supported, and a shaped, interfaced facing does that: the interfacing stabilises the edge, the seam is clipped and understitched, and the point stays a point. Cotton poplin, linen, denim, wool suiting and twill all take a facing well because the two extra layers do not show from outside.
A facing is also the only finish that can be cut on. On a straight or nearly straight edge, such as the front edge of a wrap or a boat neck, the facing is drawn as an extension of the piece and folded back along a line, with no seam at all.
Facings have two well-known faults. They flip out at the neckline and show, and they add bulk at the edge. Both are solved in the sewing: understitch the seam allowance to the facing close to the seam, trim and grade the allowances, and tack the facing to the shoulder seams by hand or with a few stitches in the ditch. On a sheer or very light fabric, the facing shows as a shadow, and that is the signal to bind or line instead.
When should you use bias binding?
When the fabric is light, the neckline is curved, or there are no corners to support. A bias strip 3 cm (1 1/4 in) wide finishes a scoop neck in viscose, lawn or crepe with almost no added weight, and because it is cut on the bias it eases around the curve without clipping. On knits, a strip cut across the stretch does the same and stretches over the head; a knit neckband is a cousin of this finish.
Binding has two versions. Wrapped binding shows a narrow band on the outside, about 6 mm (1/4 in), which can be a design feature in a contrast fabric or in the same fabric on a plain top. The bias facing turns the whole strip to the inside, so from outside there is a single line of stitching 1 cm (3/8 in) from the edge and no visible band. For a sleeveless woven top it finishes the neckline and the armholes with the same strip, which keeps everything light.
The limits: binding does not support a corner, so a square neckline needs mitred corners and some patience; on heavy fabric the folded strip is bulky and the curve can stand away from the body; and a wrapped binding stretched too tightly pulls the neckline in, so it is applied with the strip relaxed, not pulled. Finishing necklines and armholes with bias binding shows both versions step by step.
When does a lining make more sense?
When the neckline and the armholes both need finishing and you want nothing visible, or when the fabric is sheer, scratchy or so light that any facing or binding would show. A sleeveless shift dress or a fitted sleeveless top is the classic case: the lining is sewn to the outer layer around the neckline and both armholes, turned through the shoulders, and the inside is as clean as the outside, with the lining also acting as a slip.
A lining does other jobs at the same time. It stops a wool or linen dress from clinging to tights, lets a sheer fabric be worn alone, and hides seam allowances that would otherwise need finishing. For a bodice with sleeves, the lining usually stops at the armholes and the sleeve is finished separately, which is more work; at that point a facing at the neckline plus a lined bodice is a common compromise.
The cost is time and fabric. A lining doubles the cutting and most of the sewing, and the lining fabric must be chosen to match the outer fabric's care, usually a cotton lawn, a viscose lining or a polyester lining. If the garment has sleeves and a plain round neck, a lining is more than the neckline needs.
How do you keep any neckline finish flat?
Three steps apply to all three methods. Staystitch the neckline as soon as the pieces are cut, 1.2 cm (1/2 in) from the edge, so the curve cannot stretch while you handle it. Trim the seam allowance to 6 mm (1/4 in) after sewing and clip into the curve every 1.5 cm (5/8 in) so it can turn and lie flat. Understitch, which is a row of stitching through the seam allowance and the inner layer only, 2 mm from the seam, and is what keeps a facing, a bias facing or a lining rolled to the inside. Sewly's sewing guide includes these steps for every neckline option it drafts, and you can ask it what understitching means at the moment you need to do it.
Which should you choose?
- A shaped neckline with corners or a point, in a medium or heavy woven: a facing, interfaced and understitched.
- A straight front edge or boat neck: a cut-on facing.
- A round or scoop neck in a light woven, viscose, lawn, crepe or silk: bias facing, turned fully inside.
- A contrast edge as a design detail, or a quick finish on a casual top: wrapped bias binding.
- A knit T-shirt or tank: a stretched knit band, or a bias-style strip in the same knit.
- A sleeveless dress or top in any woven, especially when the armholes must be finished too: a lining, or bias facing on both edges if you want to stay light.
- A sheer fabric: a lining; the facing would show and the binding would be a dark line.
- A beginner on a first woven top: bias facing. It is forgiving, fast, and teaches you the staystitch, clip and understitch sequence you will use everywhere.