White: The Purification of Sins
The White in our uniform represented the purification of sins that we can only find in Christ alone.
You see, we praise God because Jesus did not stay dead. Three days after He was buried, He rose from the grave, proving that He was truly the King of kings and the Lord of lords. He then ascended to His Father and is seated at the right hand of the Throne of God.
The wrath of God was satisfied with the death of Jesus. On the cross, all of the sins of His children were imputed to Him, and the wrath of God was poured out on that sin. At the same time, the righteousness of Christ was imputed to His children, and we are covered by His righteousness.
The Gospel of Jesus Christ is the power of God unto salvation to everyone that believes (Romans 1:16). This means that because of the sacrifice and the resurrection of Christ, we can now have a relationship with God. This is available through Faith alone in Christ alone only because of God's Grace alone. It is by God's Grace that we are "made alive in Christ (Ephesians 2:4)" through Faith.
You can repent of your sins and God is faithful and just to forgive you of your sins and will cleanse you from all unrighteousness (1 John 1:9). You can be made pure -- "white as snow" (Isaiah 1:18).