2 Cor. 5:3 is a most crucial verse to understand.
It's not a literal white robe of
cloth that shall be given to us, but rather the indwelling presence of God's Holy Spirit within us, will instantly transform/change us into the likeness of Christ's immortality, in the moment of His visible appearance from Heaven.
The words "white robes" is symbolic of the Righteousness of God within us, and the vehicle of His Righteousness to us, is the Holy Spirit given to be WITHIN us.
But if He is not within you, then on the day of Christ's
SUDDEN and Glorious appearance, the latter part of Romans 8:9 WILL APPLY!
All Born Again Christians do have God's covering/sealing within them right now. It is the Holy Spirit within us
who shall react to Jesus' Glorious presence, thus instantly changing us into His LIKENESS of His immortality.
By having Him within us now, WE ARE READY AT ALL TIMES to greet the Savior on that Day.
2Cor.5[
2] For in this we groan, earnestly desiring to be
clothed upon with
our house which is from heaven [and is right now inside us, waiting to activate our flesh into His immortality]:
[
3] If so be that being
clothed we shall not be found naked.
[
4] For we that are in this tabernacle [mortal flesh] do groan, being burdened: not for that we would be unclothed, but
clothed upon,
that mortality might be swallowed up of life [Jesus' New life].
Rev.3[
4] Thou hast a few names even in Sardis which have not defiled their garments; and they shall walk with me in
white: for they are worthy.
[
5] He that overcometh , the same shall be clothed in
white raiment; and I will not blot out his name out of the book of life, but I will confess his name before my Father, and before his angels.
[
18] I counsel thee to
buy of me gold tried in the fire [the baptism of the Holy Spirit BY Christ. Revelation 3:20] that thou mayest be rich; and
white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see.
Rev.7[
9] After this I beheld, and, lo,
a great multitude,
which no man could number, of all nations, and kindreds, and people, and tongues,
stood before the throne, and before the Lamb [the Day of resurrection], clothed with white robes, and palms in their hands;
[
13] And one of the elders answered, saying unto me, What are these which are arrayed in
white robes? and whence came they?[
14] And I said unto him, Sir, thou knowest. And he said to me,
These are they which came out OF great tribulation, and have washed their robes, and made them white in the blood of the Lamb.
That is not talking about a specific short window of time, that you surmize. It's talking about ALL Born Again Christians
SINCE PENTECOST, who have come out of great tribulation in their lifetime.
All Born Again Saints HAVE washed their robes, and made them white.....
IN THE BLOOD OF THE LAMB.
The only way anyone "washes their robe WHITE", is by the indwelling presence and power of God's Holy Spirit.
God forbid if there be any professing Christian, who doesn't HAVE His power of God's Righteousness (the Holy Spirit) within them. It's the ONLY Righteousness that
EXCEEDS that of our own "form of godliness (righteousness)", which is by/through the Law.