"The God of heaven, whose arm moves the world, who gives us life and sustains us in health, is honored or dishonored by the apparel of those who officiate in His honor. To Moses He gave special instruction regarding everything connected with the tabernacle service, and He specified the dress that those should wear who were to minister before Him. “Thou shalt make holy garments for Aaron thy brother for glory and for beauty,” [ Exodus 28:2 ] was the direction given to Moses. Everything connected with the apparel and deportment of the priests was to be such as to impress the beholder with a sense of the holiness of God, the sacredness of His worship, and the purity required of those who came into His presence. GW 173.2"
"And thou shalt make holy garments for Aaron thy brother for glory and for beauty."
Ellen White directly references Exodus 28:2 in this passage.