“But when the king came in to look at the guests, he saw there a man who had no wedding garment. And he said to him, ‘Friend, how did you get in here without a wedding garment?’ And he was speechless. Then the king said to the attendants, ‘Bind him hand and foot and cast him into the outer darkness. In that place there will be weeping and gnashing of teeth.’ For many are called, but few are chosen.” - Matthew 22:11-14
I have recently found many younger men and women prefer non-traditional dress for their weddings. In some cases it seems to be just outright rebellion toward the established norm. In the process the marriage itself is taken down a notch in its sacred nature. From the very beginning of time, human nature (that is our sin nature) has said, "Don't tell me what to do or how to do it, I'll do it my way!" (Genesis 3:6)
Traditional wedding garments have changed over the years and may not be a litmus test of spirituality, but the need to be dressed in the righteousness of Christ will never change. The story above clearly reveals the fact that there is only one way to dress for the kingdom wedding, and it's not "our way". If we don't "put on the Lord Jesus" (Romans 13:14) then we'll be "put out" in the dark.
The application is simple my friend. Your good works will never suffice for heavenly attire. Only the finished work of a perfect Savior will be accepted. While Frank Sinatra made the song "My Way" popular in this life, the only entrance into a future heaven is "His Way". There is no better way!