The washed white color of the robe was determined by the atonement of Jesus Christ, and it represented the
righteous acts of the saints (Rev 19:8). This special class of Believers
would be resurrected first and reign with Him for a thousand years before a new heaven and earth is ushered in.
(Rev 20:4-6)
Those who died for their faith during the Great Tribulation have the privilege of being before God in His
presence and serving Him day and night.
Do you recall the message to the seven churches?
But you have a few names in Sardis who have not defiled their garments, and they will
walk with Me in white, for they are worthy. He who overcomes will thus be clothed in white garments, and I will
never erase his name from the book of life, and I will confess his name before My Father and before His angels."
(Rev 3:4-5)
[Laodicea] I advise you to buy from Me gold refined by fire so that you may become
rich, and white garments so that you may clothe yourself, and that the shame of your nakedness will not be
manifested; and eye salve to anoint your eyes so that you may see. (Rev 3:18)