Jesus promises the saints at Sardis white garments (Revelation 3:4), and also puts white garments on sale at Laodicea (3:18). But how does one overcome so as to receive the white robe?
Revelation 4-7 (the seal section) tells us. The section opens with John’s ascent into heaven to see twenty-four elders on thrones wearing white robes and crowns (4:4). After the seals have been opened, the horsemen unleashed, and the 144,000 sealed, John sees a great multitude before the throne, in the same heavenly temple as the elders, wearing white robes (7:9, 13). You get a white robe by “coming out of the great tribulation” (v. 14), by holding to the Word of God and the Witness of Jesus to the death.