Shatnez
exists when as little as one thread of linen exists in a wool garment,
or vice versa. A thread, that which has been combed and spun from
fibers, is the threshold unit beyond which
bitul (nullification) is impossible. Below that threshold and before spinning into thread it is possible to
m'vatel
(nullify) the presence of linen or wool fibers with a majority of some
other fiber. As examples: a preponderance of hemp fibers could
nullify the presence of linen fibers, likewise, camel hair could nullify
the presence of sheep's wool. If threads or fibers constituting
shatnez are apparent in the garment, either to the naked eye or through a microscope, they are considered to be
nikkar (visible) and can be sold or given to a
goy. If it's known that single thread of linen exists in a wool garment but it can't be found by any means (not
nikkar),
it cannot even be sold to a goy. However, since the prohibition
is only for wearing or draping it upon your person, it still remains suitable for
framing.
ANATOMY OF A SUIT
This is not intended as a shatnez
tester's instruction manual, and we strongly advise you not to try this
at home. But, we would like to give you a glimpse of some of the
places where linen is likely to lurk in a typical wool suit. In
the example above the shell fabric will likely be wool as labelled, but
the pin stripe could be anything from wool, silk, synthetic, or
linen. The chances of finding a greater variety of fiber types is
multiplied in a plaid jacket.
JACKET...
collar canvas:
Beneath the wool felt on the back of the collar (and sometimes embedded
within it), there will usually be a layer of fairly stiff interfacing
of horsehair canvas, synthetic, cotton, or traditionally, linen.
Additionally, a reinforcing "fold tape" is usually sewn along the collar
fold, which can sometimes be linen. If linen, it is
fairly easy for the shatnez checker to completely remove the felt,
canvas and tape, and it is one of the services we provide. We
furnish new felt and interfacing which a local tailor can cut and
attach, using the old felt as a template.
shoulder pad:
This consists of a top and bottom cover, some interior batting or
filler, and sometimes some additional layers of interfacing
material. Linen can be found in any of those places, but most
likely in the filler if it's reprocessed fiber.
sleeve head:
Several layers of canvas, padding, and sometimes sponge pad are sewn
into the armhole seam to give shape to the edge profile of the
suit. Additionally, a reinforcing tape surrounds the armhole which
can sometimes be linen.
front canvas and pad:
Typically, the canvas itself is a combination of wool, cotton,
polyester and stiffened with horsehair. However, there are many
varieties, some of which contain linen. The pad is usually virgin
material, natural or synthetic. In most manufactured suits,
however expensive, the canvas structure extends about halfway down the
coat, then continues as synthetic material fused to the shell
fabric. The use of fusible material, adhesive backed and set with a
hot press, is becoming more prevalent, even in more expensive
garments. Although less frequent than in the past, successive dry
cleanings may break the fused bond and cause bubbling in the jacket. In
bespoke or made-to-measure suits, the canvas is fully
floating, not fused, and extends to the bottom of the coat.
pocket reinforcing:
This is most often some kind of paper or synthetic "Pellon," but in
some custom suits this can be, especially in the breast pockets, extra
layers of canvas or linen.
dart: The reinforcing of this shaping seam is usually Pellon, but in better suits linen.
vent: Reinforcing similar to "dart" above.
sleeve cuff: Reinforcing similar to "dart" above.
buttons and button holes:
Linen is traditionally used as a structural thread for hard-wearing
items like buttons and button hole reinforcing. Linen, however,
tends to jam the buttonhole sewing machine, so is rarely used
on most manufactured suits. Buttons sewn with linen thread therefore
have to be done by hand. Buttonholes were traditionally
reinforced with a linen thread sewn into the surging around the button
hole, and called a "gimp." They are rarely found today.
PANTS...
inner and outer waistbands:
While the internal stiffening in most trouser waistbands is a stiff
synthetic mesh, it could be linen. The outer waistband like pocket
material and jacket lining is usually an acetate or rayon material.
buttons, buttonholes: see above
belt loops: Usually Pellon or some other synthetic material, and rarely linen.
hooks and eyes: see "inner waistband" above