Specify the neckline finish by fabric. Use a narrow bias binding or bias facing on sheer georgette and cotton voile, a stabilised facing on viscose, and a band cut shorter than the neckline on knits. Necklines gape when the curved edge stretches during sewing. They ripple after washing when the finish and the body fabric change length by different amounts.
What finishes can a kaftan or dress neckline take?
A kaftan or dress neckline can take five main finishes: a facing, a bias binding, a narrow self-fabric rolled edge, a tie or drawcord neck, and piping. Each one controls the cut edge in a different way.
- Facing. A separate piece of fabric sewn to the neck edge and turned to the inside. The New Mexico State University extension guide Facings Made Easy names three types: shaped facings, extended facings and bias facings. The same guide says the facing seam should be understitched so the facing does not roll to the outside, and tacked down at the shoulder seams.
- Bias binding. A strip cut across the grain that wraps the raw edge and shows on the outside. The bias cut lets the strip bend around the neck curve. A bias strip can also be turned fully inside as a narrow bias facing. A pattern designer’s tutorial on bias binding facings says they work best on light to medium weight fabrics, and that the strip should be pressed into the same curve as the neckline before it is sewn.
- Narrow self-fabric rolled edge. The garment fabric itself is turned twice into a very fine hem. A sewing fabric supplier recommends a rolled hem for finishing chiffon garments. On a neck curve, the turned edge and the garment under it are not the same length, so only a very narrow turn lies flat.
- Tie or drawcord neck. A channel (casing) at the neck edge carries a cord or tie, or a front slit is closed with ties. The wearer can pull the neck in. A sewing reference on fixing a neckline that is too big lists an elastic or drawstring casing as one way to stop a gaping neck.
- Piping. A folded strip of fabric inserted into the neckline seam to outline the edge. Wikipedia’s entry on piping notes the strip is usually cut on the bias. Piping sits in a seam, so a piped neckline still needs a facing or binding behind it.
Why does a loose kaftan neckline gape, and what stops it?
A loose kaftan neckline gapes because the curved neck edge has stretched, or because the neckline is cut wider than the body under it. A neckline curve runs across the bias of the fabric. The sewing reference Sew Guide on staystitching explains that neckline edges are cut across the grain, and that if the edge stretches, the finished neckline can gape or sag.
A kaftan cut can make this worse in two ways. First, where the kaftan neck opening is wide or slit, the loose body does not pull the edge back against the chest. Second, a heavy, drapey fabric hangs from the neckline, so any stretch in the edge shows as a sagging front.
Pattern maker Cashmerette writes that necklines can easily stretch out during construction, especially bias-cut V-necks. Its test is simple: if the sewn neckline measures larger than the pattern piece, the edge stretched. If it does not, the gape is a pattern fit problem, and the pattern needs a small neckline dart or reshaping.
These steps stop a kaftan neckline from gaping:
- Staystitching. A line of stitching just inside the seam allowance, sewn before the neckline is handled. Facings Made Easy puts it on the front and back neck before the facing is attached.
- Stay tape. Sew Guide describes stay tape as a thin tape that reinforces a cut edge and prevents stretching. A non-stretch tape fixes the neckline at its pattern length.
- Interfacing on the facing. The NMSU guide says interfacing prevents stretching or sagging of the neckline, and should be the same weight as the fabric or lighter.
- A drawcord or tie. On a wide kaftan neck, a casing with a cord gives the wearer control, as Sew Guide lists for over-wide necklines.
Why does a dress neckline ripple on georgette, viscose or cotton voile after washing?
A dress neckline ripples when two parts of the neck seam end up different lengths: the binding, facing, tape or thread on one side, and the body fabric on the other. The difference can come from sewing or from washing.
Ripple from sewing. If the edge or the binding is stretched while it is sewn, the two layers relax by different amounts afterwards. Thread maker Coats, in its guide to eliminating seam puckering, says that when materials with different stretch are pulled during sewing, their different relaxation can cause pucker on one face. Seamwork’s neckband tutorial makes the same point for knits: pulling while sewing is almost always what causes a wavy neckband.
Ripple from washing. Coats states that if a lining or reinforcing tape shrinks more than the base fabric, the base fabric puckers along the stitch line. It adds that soft cotton thread swells and shortens when wet, and the fabric can stay puckered after the thread dries. Coats recommends synthetic threads with low wet shrinkage.
Each fabric brings its own risk:
- Polyester georgette. Polyester absorbs very little water. The Textile School polyester reference says a heat-set polyester fabric keeps its size at the washing temperatures on its care label, but a too-hot iron can make it shrink or pucker permanently. On georgette, the neckline risk is stretch during sewing, because the fabric is fine and slippery. Our post on polyester georgette kaftans covers the fibre in more depth.
- Viscose (rayon). The Textile School rayon reference says ordinary viscose loses about half its strength when wet, and cites Ohio State extension guidance that regular rayon may stretch or shrink when wet. A viscose neck edge can therefore change length in the wash, while a polyester tape or thread beside it does not. The same page passes on care advice to air dry viscose to preserve its shape.
- Cotton voile. Cotton shrinks in washing; the Textile School polyester page notes that in a polyester and cotton blend, the cotton is the part that shrinks. If a voile body and its binding come from different fabric lots or fibres, they can shrink by different amounts and the neck seam ripples.
Thread and stitch choice also play a part. Our guide on matching thread, needle and stitch to the fabric explains the seam side of the problem.
Which neckline finish suits which fabric?
The right neckline finish depends on whether the fabric is sheer, whether it changes length when wet, and whether it stretches. The table below matches each common kaftan and dress fabric to its finish.
| Fabric | Finish to specify | Avoid | Main risk |
|---|---|---|---|
| Polyester georgette | Narrow self-fabric bias binding or bias facing; narrow rolled edge; drawcord on wide kaftan necks | A wide shaped facing, which can show through a sheer fabric | Edge stretched while sewing |
| Viscose / rayon (woven) | Staystitched neck with a shaped or bias facing, lightly interfaced; stay tape on wide or deep necks | Binding or tape that will not move with the viscose in washing; tumble drying | Fabric stretches or shrinks when wet |
| Cotton voile | Self-fabric bias binding or bias facing cut from the same fabric lot | A wide facing that shows through; binding from a different fibre | Body and binding shrink by different amounts |
| Knit (jersey) | A neckband cut shorter than the neck opening | A band the same length as the opening | Band stands away or waves |
The sources behind the table: Facings Made Easy says bias facings are often used on sheer fabrics to remove a wide facing that may show through. Seamwork says a knit neckband should always be shorter than the neck opening, because a band the same length has nothing to pull against and stands away from the body. The viscose and voile rows follow from the fibre behaviour in the section above.
A wrap dress can gape at the V for this reason too, but its own causes are the overlap depth, the tie and the crossover point, covered in why a wrap dress gapes at the V. A kaftan neckline slit closed with a button and loop also depends on how the loop is made and anchored: see button loops on kaftans and tops. On a sleeveless kaftan or dress, the armhole is the other curved edge that can gape: see armhole gape on sleeveless tops, dresses and kaftans.
What should the tech pack state for the neckline?
The tech pack for a kaftan or dress should state the neckline finish, how the edge is stabilised, and how the neckline must look after a wash. A finish named in one word leaves every one of these choices open. Our guide on how to create a tech pack covers the document as a whole; for the neckline, include these points:
- Finish type. Facing (shaped, extended or bias), binding, rolled edge, drawcord or piping, with a construction sketch.
- Finished width of the binding, facing or band, and whether it is self-fabric or contrast.
- Cut direction of any binding or piping strip: true bias.
- Stabilising. Staystitch the neckline before assembly. Where stay tape is used, say where, and that it must be non-stretch and must not shrink more than the body fabric.
- Facing handling. Understitch the facing; tack it at the shoulder seams only.
- Thread. A synthetic thread with low wet shrinkage, as Coats recommends against wash pucker.
- Knit band length as a proportion of the neck opening, approved on a sample.
- Neck measurements. Neck opening measured flat, and for pull-on kaftans, the head opening, both on the spec sheet.
- Appearance after washing. The neckline must lie flat with no ripple or gape after a wash test to the care label. Approve a washed sample, not only an unwashed one; see the top-of-production sample.
- Care label. For viscose, air dry, matching the fibre’s wet behaviour.
KK Fashion Exports has been exporting since 2003. Our minimum order for dresses, kaftans and other garments is from 200 pieces per style, per colour, and our kaftan range includes woven, embroidered, digital printed and block printed styles, as well as kaftans with tassels or pom-pom trim.
See our dresses manufacturing page for the styles we make.
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