Some time ago I was convicted by the Spirit to wear the tzitzit. I started with a katan, but I was not convinced that was the intent. After some study, I had a shirt made that I wear over my clothes and has the fringes on the four corners. The scripture that commands the tzitzit refers to garment, and in my studies the garment is something you can go out in public in. I wouldn't do that in a katan, so I asked for a shirt long enough to modestly cover me if it were the only thing I wore. I have had some questions, but nobody has been offended, at least not that they have said. One orthodox lady asked why a Irishman wore them, I simply told her I was a Torah observant follower of the Jewish Messiah. she said shalom.
Why do it at all? In my mind, Father gave the commandment for a reason. He gave the reason in this case, which is unusual. So when we look upon them we will remember His commanments to keep and do them. So I wear them because God said to, and when I look on them, I remember His commandments, and try better to keep and do them. I guess I could spiritualize or expand on what God said, but I prefer to go His way. I have a friend who put one on the mirror of his car to remind him, okay, but God didn't tell us to do that, its an expansion, is there a problem? Not if the meaning and the method don't destroy the original word, but then, I don't think we should neglect what we are directed to do to do our own thing.
It seem there is a lot of God said.... but I have a better idea.... that occurs in all of us.