Double-width fabric is woven so that the pattern exactly matches on the selvage.
From the en.wikipedia.org
Thus it creates a firm selvage with the same thickness as the rest of the cloth.
From the en.wikipedia.org
Also in industry sometimes the selvage is made thicker with a binding thread.
From the en.wikipedia.org
The selvage of commercially-produced fabrics is often cut away and discarded.
From the en.wikipedia.org
The type or motion of selvage depends on the weaving technique or loom used.
From the en.wikipedia.org
Applying the term selvage to a hand-knitted object is still relatively new.
From the en.wikipedia.org
The ribs run across the fabric from selvage to selvage.
From the en.wikipedia.org
It starts with the denim, called selvage, the thick, stiff kind some might remember getting when they were kids.
From the newsobserver.com
The selvage of a piece of curtain fabric.
From the en.wikipedia.org
More examples
Border consisting of an ornamental fringe at either end of an oriental carpet
The edge of a fabric that is woven so that it will not ravel or fray
The selvage (US English) or selvedge (British English) is the term for the self-finished edges of fabric. The selvages keep the fabric from unraveling or fraying. The selvages are a result of how the fabric is created. ...
The selvage of a knitted fabric consists of the stitch(es) that end each row ("course") of knitting. Also called selvedge, the term derives from "self-edge". ...
The edge of a woven fabric, where the weft (side-to-side) threads run around the warp (top to bottom) threads, creating a finished edge; Any edge of fabric finished so as to prevent raveling; The excess area of any printed or perforated sheet, such as the border on a sheet of postage stamps or ...
(Selvages) The tightly woven edges of fabric. They run parallel to the lengthwise grain.
The unsurfaced strip along a sheet of roll roofing which forms the under portion at the lap in the application of the roof covering.
That portion of roll roofing overlapped by the succeeding course to obtain double coverage.
An edge or edging that differs from the main part of (1) a fabric, or (2) granule-surfaced roll roofing material.