Textile construction techniques: seams (plain, French, flat-felled, overlocked), edge finishes (hems, facings, bias binding), fastenings (zips, buttons, Velcro, press studs), and shaping techniques (darts, pleats, gathers, tucks), and the purpose of each.

What this key area is asking

Making a textile item means joining, finishing, fastening and shaping fabric, and there is a correct technique for each job. SQA Higher expects you to know the main construction techniques - seams, edge finishes, fastenings and shaping techniques - and the purpose of each. This knowledge underpins the practical activity, where you must use at least eight appropriate construction techniques to a high standard, so it is examined and applied. Marks come from naming the right technique and explaining what it does for the item.

Seams - joining fabric

• Plain seam - quick and flat, used widely; the raw edges are usually neatened (overlocked or zigzagged) to stop fraying.
• French seam - the raw edges are enclosed inside, so nothing frays and the inside is tidy: ideal for sheer or unlined garments.
• Flat-felled seam - the edges are folded and double-stitched, giving a very strong, hard-wearing seam for jeans, shirts and workwear.
• Overlocked seam - stitched and neatened in one pass on an overlocker, with built-in stretch for knit fabrics and speed for mass production.

Edge finishes - tidying raw edges

• Hem - the raw edge is turned under and stitched to give a neat, non-fraying finish at the bottom of a skirt, trouser or sleeve.
• Facing - a shaped piece stitched to a neckline or armhole edge and turned inside to finish it neatly.
• Bias binding - a strip of fabric cut on the bias (so it stretches around curves) that encloses a raw edge, finishing curved edges neatly.

Fastenings - opening and closing

Fastenings let a garment be put on, taken off and adjusted:

• Zips - strong, secure closure for trousers, dresses and bags.
• Buttons - traditional, adjustable, decorative as well as functional.
• Velcro (hook-and-loop) - quick and easy, good for children's and adaptive clothing.
• Press studs (poppers) - quick, low-bulk fastening for cuffs and babywear.

Shaping techniques - making fabric three-dimensional

• Darts - a stitched, tapering fold that removes fullness to shape flat fabric to the body (bust, waist, shoulder darts).
• Pleats - folds pressed or stitched to give controlled fullness and movement (knife, box pleats).
• Gathers - fabric drawn up on a thread to create soft fullness at a seam (gathered skirt, puff sleeve, frill).
• Tucks - small stitched folds used for shaping or as decoration (pin tucks).

Examples in context

Example 1. A pair of jeans. Jeans use flat-felled seams (enclosed and double-stitched for strength), a zip fly and button fastening, topstitched edges, and a waistband with belt loops. Every technique answers the demand for a hard-wearing, frequently stressed garment, showing techniques chosen for durability.

Example 2. A child's dress. A child's dress uses gathers for soft fullness in the skirt, Velcro or large buttons for easy fastening (suited to a child), a neat facing at the neckline, and a hem at the bottom. The techniques are chosen for comfort, ease of dressing and a tidy finish appropriate to childrenswear.

Try this

Q1. State the purpose of a dart and the purpose of a hem. [2 marks]

• Cue. A dart is a stitched fold that shapes flat fabric to the body by removing fullness; a hem turns under and stitches a raw edge to finish it neatly and stop it fraying.

Q2. Explain why a French seam is suitable for a sheer blouse. [2 marks]

• Cue. A French seam encloses the raw edges inside a second line of stitching, so no fraying edges show through the see-through fabric and the inside of the blouse looks neat and tidy.