Selecting appropriate construction techniques: matching the technique to the fabric type (sheer, stretchy, bulky, hard-wearing), the position and strain on the item, the standard of finish required, and the cost and time of production.

What this key area is asking

Knowing the techniques is only half the skill; the other half is choosing the right one for the job. SQA Higher expects you to select appropriate construction techniques by matching them to the fabric type, the position and strain on the item, the standard of finish required, and the cost and time of production. This is exactly what the practical activity rewards - techniques chosen and worked appropriately - and what justification questions test in the paper.

Match the technique to the fabric

• Sheer fabrics (chiffon, voile) fray and show through, so use enclosed seams (French) and neat bias-bound edges.
• Stretchy fabrics (jersey) need seams and hems with stretch (overlocked seams, twin-needle or zigzag hems) so they do not snap when stretched.
• Bulky fabrics (fleece, coating) need flat, low-bulk seams and finishes so the garment is not stiff or lumpy.
• Hard-wearing fabrics and items (denim, workwear) need strong, double-stitched seams (flat-felled) that survive heavy use.

Consider position, strain, finish, cost and time

Beyond the fabric, four further factors guide the choice:

• Position and strain. Seams under load - shoulders, side seams, crotch, armholes - must be strong and sometimes reinforced, while low-strain seams can be simpler.
• Standard of finish. A high-quality or visible finish (a wedding dress, a tailored jacket) needs neat, enclosed, carefully pressed techniques; a hidden inside seam can be simpler.
• Cost. Cheaper products use quick, economical techniques; premium products justify slower, costlier ones.
• Time of production. Mass production favours fast machine techniques (overlocking, fusing, automated stitching); one-off or couture pieces allow slow hand finishing.

Balancing the factors

As with fabric choice, the factors can conflict: the neatest finish (hand-sewn, enclosed seams) is slow and costly, while the cheapest, fastest technique may give a lower-quality finish. The maker prioritises according to the product and market - durability and speed for workwear, finish and detail for couture - and accepts the trade-off.

Examples in context

Example 1. Swimwear in stretchy fabric. Swimwear is sewn with stretch (overlocked) seams and a twin-needle finish so the seams and hems stretch with the elastane fabric and do not snap. A rigid plain seam would fail, showing the technique chosen specifically to suit a high-stretch fabric and the strain of wear.

Example 2. A couture evening gown. A couture gown uses hand-finished, enclosed seams, hand-sewn hems and careful pressing, because the standard of finish is paramount and the price allows slow, costly work. The same garment in fast fashion would use quick machine seams, illustrating how finish, cost and time change the technique choice.

Try this

Q1. State two factors, other than fabric type, that affect the choice of a construction technique. [2 marks]

• Cue. The position and strain on the seam; the standard of finish required; the cost of production; the time available or production method (any two).

Q2. Explain why an overlocked seam suits a stretchy knitted top. [2 marks]

• Cue. An overlocked seam has built-in stretch, so it stretches with the knit and does not snap when the top is pulled on, and it neatens the edge in the same pass so the knit does not fray.