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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.

Short for 'unfinished object,' a sewing project that has been started but set aside or abandoned before it was ever completed.

The often bias-cut, slightly smaller layer of a tailored collar that sits against the neck, allowing the upper collar to roll smoothly over it without show-through.

Stitching worked close to a seam that secures a facing or lining to its seam allowance so it rolls neatly to the inside and stays hidden.

A bust dart originating from the side seam near the underarm and pointing toward the bust apex, one of the most common dart placements in bodice drafting.

A layer of fabric cut from the same pattern pieces as the fashion fabric and attached to its wrong side before construction, adding body, opacity or support without showing.

A row of stitching through the facing and seam allowances, close to the seam, that keeps the facing from rolling to the outside of the garment.

A curved, rigid strip, usually plastic-coated metal, encased in fabric channels beneath the cups of a bra to provide structural lift and support.

When top and bottom seam layers creep apart, unequal feed pressure or a fabric mismatch is usually to blame. Use a walking foot, hand-baste slippery layers together, or ease the top layer as you sew.

A hemline that dips or rises around the garment instead of sitting level usually comes from not letting the garment hang before marking, so bias areas drop further. Let it hang, then mark and true the hem.

Stitches that vary in size along a seam usually come from inconsistent feeding, a dull needle snagging the weave, or pulling fabric by hand instead of letting the feed dogs work. Let the machine feed naturally.