[felson]

the wool-linen laws are not binding for Christians, as their meaning relates to purity rather than ethics. so they fall under the same category as the dietary restrictions, which are lifted in passages such as Acts 10.

regarding the intention of the wool-linen law, the explanation that i heard is that it relates to pagan fertility practices. other religions believed that combining different things (wearing fabric of two different fibers, different seeds in the same field, boiling a young goat in its mother's milk) was somehow related to the male-female dichotomy and would thus produce fertility. prohibiting the wool-linen mixture is thus a prohibition on worshiping other gods.

but i suspect that if you asked an orthodox jew, his answer may be different.