Whatever you do, don't pin two matching socks together before you wash them. Then they both disappear, and you don't even have one sock left.
Ha ha ha.....I am the reason they wrote Murphy's Law, I have no luck and dumb things happen to me.
So if I pinned them together, I would end up with no socks...and a painful moment of dressing in the morning by finding the pin stuck in my underwear.