Matthew 22:11-14 KJV
And when the king came in to see the guests, he saw there a man which had not on a wedding garment: [12] And he saith unto him, Friend, how camest thou in hither not having a wedding garment? And he was speechless. [13] Then said the king to the servants, Bind him hand and foot, and take him away, and cast him into outer darkness; there shall be weeping and gnashing of teeth. [14] For many are called, but few are chosen.
This passage does NOT teach that the Lord requires special clothes for attendance at a church meeting, either on the part of a teaching elder or anyone else for that matter.
The custom at the time was for the celebrant to provide special festive garments for the guests. The man without the festive wedding garments was a man who wilfully rejected the offered clothes as a sign of disrespect to the king. Thus the harsh response. Jesus is not teaching that you must "dress up for church", but that those invited to the eschatological Wedding of the Lamb must not expect to enjoy the celebration while refusing to be clothed with the salvation and righteousness offered by the King.
Bernes:
A man which had not on a wedding garment - In ancient times, kings and princes were accustomed to make presents of changes of raiment to their friends and favourites, to refuse to receive which was an expression of highest contempt,
Genesis 45:22;
2 Kings 10:22;
Esther 6:8;
Esther 8:15. It was, of course, expected that such garments would be worn when they came into the presence of the benefactor. The garments worn on festival occasions were chiefly long white robes, and it was the custom of the person who made the feast to prepare such robes to be worn by the guests. This renders the conduct of this man more inexcusable. He came in his common and ordinary dress, as he was taken from the highway: and though he had not a garment of his own suitable for the occasion, yet one had been provided for him, if he had applied for it. His not doing it was expressive of the highest disrespect for the king. This beautifully represents the conduct of the hypocrite in the church. A garment of salvation might be his, performed by the hands of the Saviour, and dyed in his blood; but the hypocrite chooses the filthy rags of his own righteousness, and thus offers the highest contempt for that provided in the gospel. He is to blame, not for being invited - not for coming, if he would come, for he is freely invited but for offering the highest contempt to the King of Zion in presenting himself with all his filth and rags, and in refusing to be saved in the way provided in the gospel.