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Persistent skipped stitches across all needle types and tensions, especially after a hard jam or drop, points to hook timing out of sync with the needle. This needs professional service, not a home fix.

A lightweight paper template printed with garment pieces, seam markings, and instructions, cut and pinned to fabric as a sewing guide; commercial tissue patterns became widespread from the 1860s.

A 'tried and true' pattern that a sewist has made successfully before, knows fits well, and can sew again with confidence.

French for a test garment sewn up in inexpensive fabric to check a design's fit before cutting into the final fabric; used more often outside the US than the equivalent term muslin.

A trial garment made from inexpensive fabric to test and refine the fit and construction of a pattern before cutting the intended fashion fabric.

Loops of top-color thread on the fabric's wrong side signal top tension that's too loose, or a bobbin wound or threaded incorrectly. Tighten the top tension and rewind the bobbin evenly.

A machine needle with an extra-large eye and a deep groove designed to accommodate thick topstitching or decorative thread without excess friction.

Visible stitching worked on the right side of a garment, often with a longer stitch length or heavier thread, used to reinforce seams and add decorative definition.

A heavier-weight decorative thread used for visible topstitching, such as on jeans, giving a bolder line than standard construction thread.

The measurement taken from the base of the neck down through the crotch, used especially to fit bodysuits, leotards, and swimwear correctly.

Simple open-top bag pattern, typically constructed from two rectangular panels with straps, sewn with or without a lining, used as a foundational bag-making project.

The process of copying a pattern piece, whether from a commercial pattern, a garment, or another pattern, onto new paper so the original can be preserved and the copy altered.

A tool with a small spiked or serrated wheel, rolled along pattern lines to transfer markings onto fabric, typically paired with dressmaker's carbon paper.

An early sewing machine shuttle mechanism that travels side to side beneath the needle plate, common in machines predating the rotary hook.

Corded or padded quilting technique in which a design is outlined through two fabric layers, then stuffed from the back so the motif stands out in high relief.

A foot-powered sewing machine driven by a pedal connected to a flywheel via a belt, requiring no electricity, common before electric machines became standard.

A long, belted coat traditionally made of water-resistant gabardine, featuring a double-breasted front, storm flaps, and epaulettes, derived from military rainwear.

A fine, run-resistant warp-knit fabric with lengthwise ribs on the face and crosswise ribs on the back, common in lingerie and linings.

A finish in which a strip of stretch tricot bias tape is wrapped and stitched over the raw seam edge, common in ready-to-wear tailoring.

A basic sloper shaped to the lower body from waist to ankle, incorporating the crotch curve, used as the foundation for drafting trouser and pants designs.

The process of constructing a trouser pattern from waist, hip, crotch, and leg measurements, shaping the crotch curve, inseam, and outseam of the front and back leg pieces.

The pattern pieces and construction lines for a trouser's front closure, including the fly extension, fly shield, and zipper placement, added to the basic trouser front.

The process of separating a back-waist design line from a trouser block to create a yoke pattern piece, often absorbing the waist dart into its seam.

The exact forty-five degree diagonal line between the lengthwise and crosswise grain, the direction where a woven fabric stretches the most.

A draping technique in which fabric is positioned at a forty-five degree angle to the grainline before pinning, exploiting bias stretch to create soft, body-skimming folds.

A skirt fitted closely through the hip and thigh that flares abruptly near the knee, resembling the shape of a trumpet bell.

A small stitched fold of fabric, similar to a pleat but generally narrower, used mainly for decorative effect or subtle shaping.

A fine, lightweight net fabric with a hexagonal mesh, used for veils, tutus and skirt volume; does not fray, so edges can be left raw.

A loose, straight or lightly shaped top extending to the hip or thigh, historically derived from ancient draped garments and worn over trousers or leggings.

A raised ridge forming along a line of stitching on stretch fabric happens when tension is too tight or the stitch is too dense for the fabric's give. Loosen tension and use a walking foot with a stabilizer.

A seam finish made by folding the raw edge of the seam allowance under a small amount and edge-stitching it in place.

A flat, tightly woven twill-weave tape used to stabilise seams, reinforce waistbands, and bind edges without adding bulk.

A weave structure with diagonal ribs formed by offsetting the weft float by one warp thread each row, giving fabrics like denim and gabardine extra drape and durability.

A sewing machine needle with two shafts joined to a single shank, producing two parallel rows of stitching on top and a zigzag underneath, used for hems on knits.

A hem stitched with a double needle to create two parallel rows of straight stitching on top and a zigzag-like stretch stitch underneath, standard for knit hems.

A side seam or inseam that spirals around the leg or body instead of running straight comes from pieces cut off-grain or one layer eased more than the other while sewing. Recut on true grain where possible.