Matthew 22:1-14 is a parable, and it has nothing to do with ceremonial symbolic underwear.
We are told in the New Testament to put off the old man (Colossians 3:9 and Ephesians 4:22) and put on Jesus Christ (Romans 13:13 and Galatians 3:27).
The man without the wedding garment is cast out because he hasn’t been called by God and regenerated by the Holy Spirit. The problem is not that he is wearing the wrong underwear, it’s that he wasn’t invited to the wedding feast.
Look at Ezekiel 16–the whole chapter is absolutely beautiful–God finds us wretched, filthy, and playing harlot, and He dresses us in glorious new clothing and makes us his bride.
Rituals and ceremonial objects won’t save you. Only the grace of God and the blood of the Lamb will.
(This post is adapted from a comment on Wheat & Tares, and that comment was mostly a paraphrase of John Calvin’s commentaries).
Sailing to Byzantium 