Tips for sewing a snap placket on a child’s top

A snap placket can make a handmade child’s top easier to pull over the head while adding a lovely ready-to-wear finish. It is especially useful on knit garments for babies and young children, where a little extra room at the neckline can make dressing much simpler.

The method may look fiddly at first, but careful preparation does most of the work. Accurate marking, suitable interfacing and a steady approach to attaching the snaps will help prevent stretched fabric, uneven fastenings and bulky layers.

These tips are useful for Love Notions patterns and other independent sewing patterns designed for children’s tops. The same principles also apply when adapting a crew neck, envelope neckline or simple raglan shirt to include a shoulder or centre-back opening.

Choose a suitable fabric and pattern

Light to medium-weight jersey is usually the easiest fabric for a child’s top with a snap opening. Cotton elastane jersey gives comfortable stretch and recovery, while French terry or a light sweatshirt knit can work for a warmer version. Very loose, unstable or highly textured knits may be harder to control around the placket.

Check that the pattern has enough neckline room for the intended opening. A snap placket does not need to be long, but it must extend far enough for the garment to pass comfortably over the child’s head. Follow the designer’s instructions if the pattern already includes a placket. If you are adding one yourself, preserve the original seam allowance and avoid cutting away more neckline than necessary.

Wash and dry the fabric before cutting, using the same care method you expect for the finished garment. Children’s clothes are frequently washed, so pre-shrinking helps the neckline and fastening remain stable after laundering.

Prepare the placket pieces carefully

Cut the placket strips with the greatest accuracy you can manage. On a stretchy knit, the direction of greatest stretch generally needs to run across the body of the top rather than along the length of a narrow binding strip. However, always check the pattern instructions, since the best grain direction depends on the construction method.

A placket can be made from self-fabric, rib knit or a contrasting jersey. Rib is forgiving and stretches easily, but it may look different from the main fabric. Self-fabric creates a coordinated finish, although it may need firmer stabilisation. Cut two matching pieces when the design uses an outer and inner layer, and mark the right and wrong sides immediately.

For a soft decorative finish at the hem, learn about lettuce hems before combining that detail with a placket. A ruffled hem can balance a simple snap opening, but keep the neckline finish flatter and more stable so it remains comfortable against the child’s skin.

Stabilise the opening before sewing

The fabric around the snaps needs support. Without it, the repeated pulling action of opening and closing the garment can stretch the knit or cause the snaps to tear through the fabric. Use a lightweight knit interfacing, a narrow strip of fusible stay tape or a small piece of interfacing behind each snap area.

Test the interfacing on a fabric scrap first. It should add stability without making the placket stiff or uncomfortable. For very lightweight jersey, two slim layers may be more effective than one heavy layer, because they spread the strain while retaining flexibility.

Transfer every marking from the pattern, including the fold line, stitching line and snap positions. A washable fabric pen, chalk pencil or tiny tailor’s tack can be useful. Avoid relying on visual estimates, as even a few millimetres can make the two sides appear misaligned.

Sew the placket in a controlled order

Before attaching anything to the garment, press the placket pieces according to the pattern instructions. A clear fold gives you a reliable guide and reduces the chance of catching the inner layer unevenly. Use a pressing cloth when working with heat-sensitive fabric or fusible interfacing.

Sew with a ballpoint or stretch needle and a stitch that allows the fabric to retain some movement. A narrow zigzag, lightning stitch or serger seam may be appropriate for the joining seams, while a straight stitch can be used for short areas that have been stabilised. Test on scraps and gently stretch the seam to check that it does not pop.

When attaching the placket, keep the garment flat rather than stretching it to fit. Match the centre marks and raw edges first, then distribute any small amount of ease between the clips or pins. Sew slowly over the neckline curve and stop with the needle down whenever you need to reposition the fabric.

Construction choice	Useful when	Points to watch
Self-fabric placket	You want a coordinated finish	Add enough interfacing for snap support
Rib knit placket	The neckline needs extra stretch	Match the rib direction and recovery
Shoulder opening	Dressing ease is needed near the neck	Keep both sides symmetrical
Centre-back opening	You want a simple straight placket	Check that it does not rub the neck
Plastic snaps	The garment will be washed often	Use a reinforced area and test the tool
Metal snaps	You want a firm, decorative fastening	Check for sharp edges and added weight

Attach snaps with accurate spacing

Choose snaps that suit the fabric weight and the child’s age. Plastic snaps are lightweight and comfortable, while metal snaps can provide a strong closure on a slightly heavier top. Whichever type you choose, read the manufacturer’s instructions carefully and practise on a layered scrap that matches the finished placket.

Mark the snap centres from a single reference line rather than measuring each one from a different edge. This keeps the spacing consistent. For a short neckline opening, two snaps may be enough; a longer placket may need three or more. Leave enough fabric between the snap and the edge so the fastening does not distort the seam.

Snap-setting pliers, a hand-sewn press or a purpose-made kit can all work well, depending on the fastener. Apply firm, even pressure and check that the cap, socket, stud and post are assembled in the correct order. Test each snap several times before finishing the garment.

The two sides should overlap in the same direction from top to bottom. Mark one side as the overlap before installing any fasteners, then close the placket and transfer the matching positions through the layers. This simple step prevents the common problem of snaps that are individually correct but fail to meet when the garment is closed.

Check the fit and finish

After sewing the opening, try the top on a similar-sized garment form or check it against a well-fitting child’s top. The neckline should lie flat without gaping, twisting or pulling. A centre-back snap placket should open easily while remaining comfortable at the nape of the neck.

Inspect the inside for bulky seam allowances, exposed interfacing or scratchy snap components. Trim only after confirming that the seam is secure, and finish the raw edges with an overlocker, zigzag stitch or suitable binding. If the placket feels thick, grade the seam allowances so each layer finishes at a different width.

A centre-back opening can also be useful when the neckline needs a little extra shaping. If the garment fits well through the body but pulls across the upper back, adding a centre-back seam may improve the shape before you add the fastening. Make any fit adjustment on the pattern first, then transfer the final lines to the fabric.

Practical checks before sewing

Use this short checklist before attaching the snaps:

• Confirm that the opening is long enough for the child’s head and wide enough for comfortable dressing.
• Fuse or sew stabiliser behind the entire snap area, rather than placing support only beneath individual fasteners.
• Test the needle, thread, stitch and interfacing on a scrap of the actual fabric.
• Mark snap positions from the centre line and check the overlap before setting them.
• Wash the completed top once and inspect the placket for stretching, puckering or loose snaps.

If the placket has stretched during sewing, steam it lightly and allow it to cool flat before assessing the result. Do not pull it back into shape while warm. For a neckline that still feels loose, a narrow line of stabilising stitches inside the seam allowance can help, provided it does not reduce the opening too much.

When a snap has been installed incorrectly, resist the urge to force it out with ordinary scissors. Use the appropriate removal tool or carefully dismantle it with small pliers, protecting the fabric with a scrap of card. Reinforce the area again before fitting the replacement.

A well-made snap placket turns a basic child’s top into a practical everyday garment. Take time with the markings, support the knit before adding hardware and test each stage on spare fabric. Once the process becomes familiar, you can use the same approach for baby bodysuits, sleepsuits, cardigans and handmade gifts. Choose a favourite pattern, prepare a fabric scrap and practise the opening before cutting into your main fabric.