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Stitches that sit slack and don't lock into the fabric come from top tension set too low. Increase the top tension gradually and test until stitches lock in the middle of the fabric.

Fabric pulled down into the needle plate at the start of a seam happens when feed dogs grab thin fabric before the stitch locks. Start on a scrap leader and hold both threads taut behind the foot.

A machine that locks up, often with a knot of thread underneath, usually means the bobbin is threaded backward or wound around the case. Clear the jam by hand, rewind the bobbin, and rethread from scratch.

Routine application of sewing-machine oil to designated moving metal parts to reduce friction, prevent wear, and keep the machine running smoothly and quietly.

A buttonhole formed by a dense zigzag stitch worked around a slit, either with a buttonhole foot or an automatic buttonhole function.

A hem finished by turning the raw edge up once or twice and securing it with a straight line of machine stitching visible on the right side.

A British government campaign launched in 1943 during wartime rationing that taught households to repair, alter, and repurpose existing clothing rather than buy new garments.

A short, straight standing collar that encircles the neck without folding over, named for its resemblance to Chinese formal dress.

A dress with a hemline extending to the ankle or floor, cut in varying silhouettes from fitted to flowing.

Clothing that was sewn by the wearer themselves, as distinct from clothing that was bought ready-made or store-bought.

A sewing machine controlled by manual dials and cams rather than a microprocessor, offering a fixed set of stitches driven by mechanical linkages and gears.

Fabric going stiff or glossy under the iron has actually begun to melt, which happens with polyester, nylon, or spandex pressed too hot. Always test heat on a scrap first and use the lowest workable setting.

A seam that has come apart along its stitching line, usually at a stress point like the underarm, needs the old thread trimmed away and the seam restitched, often reinforced with a bar tack.

Clothing designed and constructed according to conventions of masculine dress, typically featuring structured tailoring and standardized sizing.

Ultra-soft, plush polyester knit fabric with a short pile, popular for baby items, blankets, and stuffed toys for its softness and warmth.

Seams that won't align smoothly, bunching at one end, usually trace to notches cut wrong or omitted entirely. Cut notches outward from the seamline as small triangles, matching the pattern exactly, and never skip them.

Side seams that don't align at the waist, hem, or underarm when laid flat usually come from uneven seam allowances or one piece eased more than the other. Pin at key match points and check the allowance.

A rough, quickly sewn test version of a garment or design, made to check fit or check a construction method before committing to the final fabric.

A pattern printed with several nested cutting lines for different sizes on the same sheet, letting a sewist choose or blend sizes as needed.

A plain-weave, low-cost cotton fabric ranging from sheer to coarse, commonly used for garment toiles and testing patterns before cutting fashion fabric.

A test garment sewn from plain cotton muslin fabric to check a pattern's fit and proportions before committing to the final fabric; the American term for a toile.

A raised, directional surface texture, as on velvet or corduroy, that catches light differently depending on which way the fabric faces.

Small square of fabric, hemmed or mitred on all sides, used at the table and often made in matching sets as a simple sewing project.

A hem folded up a small, consistent width, often three to six millimeters, and stitched close to the fold; common on linings and lightweight fabrics.

A seam stitched with a narrow, short zigzag stitch on a conventional machine to allow the stitching to stretch with knit fabric without popping.

The snapping of a sewing machine needle, typically from hitting a pin, a bent needle, the wrong needle size, or fabric being pulled against the feed.

A snapped needle usually means fabric was pulled while sewing, a pin was hit, or the needle was too fine for the fabric. Slow down, clear pins from the stitch path, and size up the needle.

The flat metal plate beneath the needle and presser foot, marked with seam allowance guidelines and pierced by openings for the feed dogs and needle.

Top thread pulling free from the needle on the first few stitches is usually too short a tail left when starting, or threading with the presser foot down. Leave longer tails and thread with the foot raised.

Interfacing made from bonded or pressed fibres with no grainline, cuttable in any direction, generally lower cost but with less natural drape than woven types.

A small triangular or single mark cut or printed along a pattern piece's edge, used to line pattern pieces up correctly with each other during sewing.

A small mark or triangular clip on a pattern piece's cutting line used to align pieces correctly during construction and indicate seam allowances or ease points.

Small marks cut or drawn into the seam allowance edge of a pattern piece to indicate matching points between pieces, easing locations, or the front and back of a garment.

Cutting small wedge-shaped notches out of a curved seam allowance, especially an outward curve, to remove excess bulk so the seam lies flat.

The small supporting supplies needed to complete a garment beyond the fabric itself, such as thread, buttons, zippers, hooks, and elastic.

A directional print ending up sideways or inverted on part of a garment happens when pieces are cut without checking the print's orientation. Lay out all pieces facing the same way before cutting.

One-piece infant garment covering the torso and closing at the crotch with snaps, combining a top and bottom into a single easy-change piece.

Video-based instruction in garment construction delivered through websites and apps, expanding access to structured sewing education beyond in-person classes since platforms like Craftsy launched in the early 2010s.

A discussion website organized around threads where sewists ask questions, share projects, and troubleshoot techniques, an early form of digital sewing community predating blogs and social media.

A one-piece garment combining trousers with a bib front and shoulder straps, traditionally worn over clothing for manual work.