“Blended fabrics” happened to be specifically linen and wool. Anything else, from what I researched, is fine. The verse from the YLT is as follows (Deuteronomy 22:11):

`Thou dost not put on a mixed cloth, wool and linen together.

Apparently, from what I searched, only the Levitical priests were to have this combination as a result of this. Otherwise, people would be confused if a non-priest were to wear this combination.

For your point on shellfish, that’s directly in reference to the Kashrut system (not the one Khazars practice nowadays) found in Leviticus 16. It’s that simple, really.

Those are two of 83 commandments most people who practice the Scriptures absolutely hate.