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Oilcloth
A tightly woven cotton fabric coated with a waxed or vinyl finish to make it waterproof and wipeable, commonly used for bags, aprons and outdoor items.
intermediate · Speciality fabrics
One-handed dressing adaptation
Garment modification, such as replacing back closures with front ones or substituting easier fasteners, that allows a wearer to dress independently using only one hand.
intermediate · Adaptive & maternity
One-piece swimsuit
A single-piece swimming garment covering the torso, constructed from stretch fabric with reinforced linings at the bust and crotch.
intermediate · Lingerie & swimwear
One-way print sewn upside down
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.
beginner · Fabric handling problems
Onesie
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.
beginner · Children & menswear
Online sewing course
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.
beginner · Sewing community & media
Online sewing forum
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.
beginner · Sewing community & media
Organza
A crisp, sheer plain-weave fabric traditionally of silk, now often polyester, used for structure, overlays and interfacing in eveningwear.
intermediate · Woven fabrics
Ottoman fabric
Fabric woven with pronounced horizontal ribs, heavier and stiffer than a plain rib knit, used for structured garments, coats, and accessories.
intermediate · Woven fabrics
Outseam
The measurement of a pant leg from the waistband down to the hem, taken along the outer leg seam rather than the inner one.
intermediate · Measurement terms
Overalls
A one-piece garment combining trousers with a bib front and shoulder straps, traditionally worn over clothing for manual work.
beginner · Jeans & workwear
Overcasting foot
A presser foot with a guide pin or brush that stitches over a raw fabric edge to prevent fraying, mimicking a serger's edge finish on a standard machine.
intermediate · Presser feet
Overcoat
A long, heavy outer coat worn over other clothing for warmth, typically extending to the knee or below and tailored with structured shoulders.
advanced · Outerwear & tailoring
Overlocker
A machine that simultaneously trims a fabric edge and encases it in interlocking looped thread, using multiple threads, needles, and loopers to finish seams quickly.
beginner · Overlockers & coverstitch
Overlocker cutting blade
The upper and lower knives on a serger that trim the fabric edge just ahead of the needles as the seam is stitched.
intermediate · Overlockers & coverstitch