5th Seal White Robes
White Robes of the righteous saints who had been killed, and who had been told to rest until the rest of the saints that are to be killed are killed.
White robes are a symbol of purity.
Background Reading:
Revelation 6:9-11
The 5th seal White robes
9 When he opened the fifth seal, I saw under the altar the souls of those who had been slain because of the word of God and the testimony they had maintained. 10 They called out in a loud voice, "How long, Sovereign Lord, holy and true, until you judge the inhabitants of the earth and avenge our blood?" 11 Then each of them was given a white robe, and they were told to wait a little longer, until the number of their fellow servants and brothers who were to be killed as they had been was completed.