These verses discuss the concept of mixing materials and fibers that are of completely different characteristics. But many do not understand that these verses do allow for the mixture of certain fabrics while being within God’s Law. God established these laws to ensure that low quality fabrics are not produced.
All clothing is made from two different kinds of naturally occurring fibers: (1) Cellulose fiber, which is made from plants. This is typically linen and cotton; (2) animal protein fiber. Fabrics such as wool and silk fall into this category.
A question also arises regarding synthetic, man-made fibers such as nylon, polyester, rayon, etc. Although unknown to many, even synthetic fibers are created in such a manner that they mimic the characteristics of the materials they are combined with. If this were not the case, a low quality product would be produced. When you mix fibers of varying characteristics, you create a fabric that is of low quality and will wear out quickly.
You need not throw away materials made of mixtures listed above. The materials are NOT sin in themselves. God simply does not want manufacturers to create low-quality products and take advantage of—and deceive—consumers. Such actions would break the spirit of the Eighth Commandment.
While it is not a sin to own such products, it is recommended that you buy the best quality that you can afford. Your appearance should honor God. Cheap imitations, either in clothing or one’s character, do not. If you buy quality clothing, you are setting an example. If this example extends to your conduct, you are representing the lifestyle of a quality Christian. That honors both yourself and God.