meaning of Baptismal garment

a quote:
When the Catechumen is baptized, he is given a white robe, representing the righteousness that he has received in baptism, by the infusion of sanctifying grace and faith, hope, and agape into his soul. The priest (or bishop) then says to him, “Receive this baptismal garment and bring it unstained to the judgment seat of our Lord Jesus Christ, so that you may have everlasting life.” What it means, to bring it unstained to the judgment seat of Christ is never to commit a mortal sin for the rest of one’s life, i.e. never to drive from the soul the agape the Holy Spirit infused into him at his baptism. Part of the command then, to love God, is to guard and preserve the agape in his soul. With that disposition (i.e. virtue) of charity in his soul, he may walk in the light, and not in darkness, fulfilling the Lord’s command to love God with all his heart, soul, mind and strength, and loving his neighbor as himself, for God’s sake.http://www.calledtocommunion.com/2010/03/st-thomas-aquinas-on-penance/comment-page-1/#comment-20597 from comment 12