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Bamboo fibre
A regenerated cellulose fibre processed from bamboo pulp, marketed for softness and breathability though chemically similar to viscose rayon.
intermediate · Synthetic & regenerated fibres
Bar tack
A short, dense zigzag or hand-worked reinforcement stitched at points of stress, such as pocket corners or fly ends, to prevent seams from tearing open.
intermediate · Couture
Bar tack machine
An industrial machine that sews a small, dense block of zigzag stitches to reinforce stress points such as pocket corners and belt loops.
advanced · Industrial machines
Barrel cuff
A single-layer shirt cuff fastened with one or two buttons, named for its cylindrical shape when closed around the wrist.
beginner · Sleeves & cuffs
Barthélemy Thimonnier
French tailor who patented an early chainstitch sewing machine in 1830 to make army uniforms; rioting tailors, fearing job losses, destroyed his workshop in 1831.
advanced · Sewing technology history
Base layer
A close-fitting garment worn next to the skin beneath other clothing, designed to wick moisture and regulate body temperature during activity.
beginner · Activewear
Basic block
A general term for any foundational, unfitted-detail pattern piece—such as a bodice, skirt, sleeve, or trouser block—from which other pattern designs are developed.
beginner · Pattern blocks
Basting
Long, loose, temporary stitches, sewn by hand or machine, used to hold layers of fabric in place for fitting before permanent stitching.
beginner · Construction terms
Basting stitch
A long, loose straight stitch used to temporarily hold fabric layers together for fitting or easing before permanent stitching is sewn.
beginner · Stitches & settings
Batik
A wax-resist dyeing technique in which molten wax is applied to fabric to block dye from certain areas, producing intricate patterns; long practiced in Indonesia, especially Java, and recognized by UNESCO in 2009.
intermediate · World sewing traditions
Batiste
Fine, lightweight, closely woven fabric, softer and slightly more opaque than voile, traditionally cotton or linen, used for blouses, baby clothes, and heirloom sewing.
beginner · Woven fabrics
Batting (quilting)
Layer of loose fibre wadding, made from cotton, wool, polyester, or blends, used as the insulating middle layer of a quilt sandwich or a padded garment.
beginner · Speciality fabrics
Bead embroidery
Surface embellishment technique in which beads are stitched individually or in strings onto fabric with a beading needle and thread to create texture, pattern, or sparkle.
intermediate · Embellishment & surface design
Bell sleeve
A sleeve fitted at the shoulder that flares progressively wider toward the wrist, producing a bell-shaped silhouette at the hem.
intermediate · Sleeve types
Bemberg rayon
A trademarked lightweight cupro rayon lining fabric prized for a silk-like hand, breathability and antistatic properties compared with polyester linings.
intermediate · Linings
Bent needle
A needle that clicks against the plate or skips stitches is often bent from nicking a pin or age. Replace it immediately, since a bent needle can also throw off hook timing.
beginner · Machine problems
Bermuda shorts
Tailored shorts with a hem ending just above the knee, cut with a fitted waist and straight or slightly tapered leg.
beginner · Trousers & shorts
Besom pocket
An inset pocket finished with two narrow folded strips forming lips on either side of a slit opening, commonly used on tailored jackets and trousers.
advanced · Pockets
Bespoke
Originally a term for custom tailoring made entirely to one individual customer's specifications, now used more loosely for any made-to-order garment.
intermediate · Historical terms
Bespoke tailoring
A method of making a garment, typically a suit, individually from a unique pattern drafted to one client's measurements, involving multiple fittings and largely hand-sewn construction.
intermediate · Tailoring traditions
Beta pattern
An early, not-yet-finalized version of a sewing pattern sent out to testers for feedback before the pattern's official public release.
intermediate · Pattern terms
Bias
Any diagonal direction across a woven fabric that is not parallel or perpendicular to the grain, where the fabric has more give and stretch.
beginner · Fabric & grain terms
Bias (sewing)
The diagonal direction across a woven fabric, at 45 degrees to the grainlines, along which fabric has maximum stretch and drape; used for bindings and fluid-cut garments.
intermediate · Fabric properties
Bias binding
A narrow strip of fabric cut on the bias and folded to encase a raw edge, allowing it to curve smoothly around necklines, armholes and hems.
beginner · Trims & tapes
Bias cut
A cutting technique in which pattern pieces are placed at a 45-degree angle to the fabric's grainline, producing extra drape, stretch, and a fluid hang.
advanced · Layout & cutting
Bias distortion
Edges or seams that stretch and lose their shape happen when fabric cut near the bias grain is handled without support. Stay-stitch bias edges promptly after cutting and avoid pulling the fabric while sewing.
intermediate · Fabric handling problems
Bias facing
A narrow strip of bias-cut fabric sewn to an edge and turned to the inside, used to finish curved edges with minimal bulk.
intermediate · Edges & facings
Bias tape maker
Small tool that folds a strip of bias-cut fabric into even single- or double-fold tape as it is pressed, speeding up preparation of binding for edges and facings.
beginner · Edges & facings
Bias-bound neckline
A neckline finished by binding the raw edge with a bias strip instead of a separate facing, giving a narrow, clean edge.
beginner · Collars & necklines
Bicep adjustment
A pattern alteration that adds or removes width in the upper sleeve to match an arm circumference that differs from the block's assumed bicep measurement.
intermediate · Fit adjustments
Bicep circumference
The measurement taken around the fullest part of the upper arm, used to check and adjust the fit of a sleeve pattern.
intermediate · Measurement terms
Bicep measurement
The circumference of the upper arm at its fullest point, used to ensure adequate width across the sleeve cap and upper sleeve of a garment.
beginner · Measuring
Big 4
A nickname for the four long-established American pattern companies: Butterick, McCall's, Simplicity, and Vogue Patterns.
beginner · Community slang & abbreviations
Big Four pattern companies
A collective term for the four major North American commercial pattern publishers—Simplicity, McCall's, Butterick, and Vogue—known for tissue-paper multi-size patterns sold in retail envelopes.
beginner · Pattern formats & sources
Bikini
A two-piece swimsuit consisting of a separate top and bottom that expose the midriff, typically constructed from stretch swim fabric.
intermediate · Lingerie & swimwear
Bishop sleeve
A long sleeve that is full through the forearm and gathered into a fitted cuff at the wrist, historically associated with clerical and Victorian dress.
advanced · Sleeve types
Blanket stitch
A looped edge stitch that wraps around a raw or folded edge, used to finish edges or attach appliqué.
intermediate · Hand sewing
Blazer
A tailored jacket, single- or double-breasted, structured with shoulder padding and often lapels, worn as smart separates rather than part of a matched suit.
advanced · Outerwear & tailoring
Blind hem
A hem stitched so the stitching is nearly invisible from the right side, worked by hand with a blind hemming stitch or by machine with a blind hem foot.
intermediate · Hems
Blind hem foot
A presser foot with a guide bar that runs along a folded hem edge, positioning the needle to catch only a thread or two for an invisible hem.
intermediate · Presser feet