You’ve heard of kosher food, but what about kosher clothes? Just like it is forbidden to eat a mixture of milk and meat, so too the Torah prohibits wearing a mixture of wool and linen. It’s called shatnez.
Why the Torah prohibits this mixture remains a mystery. Some write that the combination of these two materials confuses vital energies. Nevertheless, the matter still lies beyond our comprehension.
Based on manufacturing norms, most clothing can be presumed shatnez-freeAny cloth that might cover a person—including blankets, and even shag rugs—must be shatnez-free. Problem is that “100% wool” garments may still contain up to 5% of other materials. Also, labels often only describe the shell of the garment, ignoring padding and ornamental threads.
Nevertheless, based on manufacturing norms, most clothing can be presumed shatnez-free. Principally, you need to check your suits, skirts, woolen coats and imported pants. Call a shatnez laboratory to find out whether a particular garment requires shatnez testing.
A shatnez lab is where trained testers take appropriate samples from a garment (without ruining the garment) and examine them under a microscope to identify the fibers. Most major Jewish communities will have such a lab. They also will receive and return garments by mail. Your rabbi can direct you to the closest laboratory.
In most cases, a garment that contains shatnez can be fixed in the laboratory for a minimal cost. It’s a minor tailoring job. There is the rare case, however, when the operation just can’t be done. So hold on to your sales receipt!
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There is also a prohibition (Deuteronomy 22:9) against sowing two types of seed in the same vineyard, but that's how you get new varieties of grapes.
Somewhere, I can't remember where, there is a prohibition against mutilating animals; yet the word "ox" is used repeatedly. You can't get an ox without mutilating a bull.
A lot of this is confusing. If it weren't, we would have finished our Torah studies 2500 years ago.
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