Sometimes the sides do not have seams, but are finished with the selvedge only.
From the en.wikipedia.org
To maximize yield, traditional jean makers use the fabric all the way to the selvedge edge.
From the en.wikipedia.org
Depending on what precious selvedge you choose and what you want done to it, they'll cost as much as $800 or more.
From the 6thfloor.blogs.nytimes.com
They're handmade with fabrics such as selvedge Japanese denim, Italian chambray, American canvas and Japanese bull denim and herringbone.
From the latimes.com
More examples
Selvage: border consisting of an ornamental fringe at either end of an oriental carpet
Selvage: 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. ...
Alternative spelling of selvage
(Selvedged) Similar to merrowing in both appearance and purpose, but this edge finishing is performed with a sort of cross-stitch (very much like a button-hole stitch) rather than by using a merrowing machine, so there is no pigtail remnant and the edging lacks the look of merrowing.
The area between the edge of a rug and the fringe. The selvedge is the same material used to form the warp and weft. A design can be added to the selvedge to enhance the look of a rug.
[eX 26:4; Ex 36:11] the edge of a cloth, where it is closed by complicating the threads; a woven border, or border of close work.
You will also see this word spelled selvage. All knitting has a selvedge on each side. It only means the first and last stitches. If it's something that will be seamed, these are the stitches that will be used to seam the piece together; they will no longer be visible when it is sewn. ...
The gummed border around a stamp pane that is usually discarded after the stamps have been used.