I notice that the first part of Revelation 14 sees the 144,000 in their Resurrected states but still standing on The Earth on Mt.Zion. (correction, I now view this as being the Heavenly Zion, the Rapture was in Chapter 12).
I see many reasons to place the Seventh Trumpet sounding on the First of Tishri. Among the things that happens after the 7th Trumpet is sounded is The Temple being opened in heaven and the Ark being seen. Yom Kippur on the 10th of Tishri was the only day the High Priest was allowed to enter the Holy of Holies and see the Ark.
The concept of Yom Kuppor is first introduced in Leviticus 16.
In Verse 2.
And the LORD said unto Moses, Speak unto Aaron thy brother, that he come not at all times into the holy place within the veil before the mercy seat, which is upon the ark; that he die not: for I will appear in the cloud upon the mercy seat.Cloud imagery, interesting in light of Revelation 14, and other Parusia passages.
I also think about how Pre-Tribbers and Pre-Wrathers think wearing White Robes in Revelation 7 means the Multitude is already Resurrected. But I think Revelation 14 has more indisputable Resurrection terminology.
Leviticus 16 also tells us how Aaron had to put on a special purified Linen Robe before entering The Holy Place on Yom Kippur in verse 4. But down in verse 23 "And Aaron shall come into the tabernacle of the congregation, and shall put off the linen garments, which he put on when he went into the holy place, and shall leave them there:"
I think the White Robe represent temporary garments worn only while unresurrected. But they'll be left behind before the High Priest leaves The Temple. Like the cloth Jesus was buried in.