DY,
I don’t personally agree with PETA’s agenda (at least on the whole, I absolutely believe in not being cruel to animals).
However, at least butchering a cow gives sustenance to a person. You can use the leather from the cow to make shoes.
Butchering an animal to make a hat does seem wrong to me. Unless you were going to freeze in the depths of Siberia, in which case it would be pikuach nefesh.