I find it interesting that for all that churches preach that we are not under the law but under grace, when it comes to tithing, look out.
They are as legalistic as it comes and quote the OT passages left and right to justify their teaching that Christians should tithe.
And yet they have no problem with wearing cotton/polyester blends. :-)
((((I prefer 100% Cotton myself, but not because of the Law. It just feels nicer)))