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Bagging out
A technique for constructing and turning a fully lined garment, such as a jacket, right side out through a small opening so all raw edges end up enclosed.
advanced · Linings & interfacing
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
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
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
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
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
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
Block
A basic pattern shape, drafted to fit a specific set of body measurements without seam allowances or design details, used as the foundation for other patterns; called a sloper in American usage.
advanced · Pattern terms
Blocking (fabric)
Dampening or steaming a piece, especially a knit, and pinning it to dry in a set shape and dimension to correct distortion before or after construction.
advanced · Care & preparation
Bobbin case tension screw loose
Bobbin thread that pulls with no resistance, causing loopy stitches, usually means the small screw on the bobbin case has loosened. Turn it slightly clockwise and test on scrap before sewing the garment.
advanced · Machine problems
Boiled wool
A knitted or woven wool fabric that has been felted through heat, moisture and agitation, producing a dense, non-fraying fabric that needs no seam finishing.
advanced · Knit fabrics
Boning
Rigid or semi-rigid strips, historically whalebone and now plastic or steel, inserted into channels within a bodice to maintain a fitted, structured shape.
advanced · Couture
Boning (corsetry)
Rigid or semi-rigid strips, of steel, plastic or historically whalebone, inserted into channels to shape and support structured garments such as corsets and strapless bodices.
advanced · Fastenings & hardware
Boro (textile)
A Japanese tradition of patching and mending indigo cotton textiles with layered scraps, born of necessity among rural families from the Edo period into the 20th century and later admired as folk art.
advanced · World sewing traditions
Bound buttonhole
A buttonhole finished with folded fabric strips, or lips, instead of thread, giving a tailored, couture-quality opening usually made before the garment is fully assembled.
advanced · Closures
Bra
An undergarment designed to support and shape the bust, typically constructed with cups, a band, and shoulder straps.
advanced · Lingerie & swimwear
Bridle stitch
A line of hand or machine stitching that secures twill tape along a jacket's roll line and front edge, controlling stretch and maintaining shape during tailoring.
advanced · Tailoring
Bubble skirt
A skirt with an outer layer gathered at the waist and again at the hem into a lining, creating a rounded, puffed silhouette.
advanced · Skirts
Buckram
A very stiff, heavily sized woven or non-woven fabric used to add rigid structure, notably in hat brims, belts and structured bag panels.
advanced · Interfacing & stabilisers
Bustier
A fitted, often boned bodice-length undergarment or top that shapes the torso from bust to waist, typically worn without a separate bra.
advanced · Lingerie & swimwear
Buttonhole machine (industrial)
A dedicated industrial machine that automatically cuts and stitches buttonholes at high speed with consistent quality for mass garment production.
advanced · Industrial machines