While the Israelites lived in the wilderness, roughing it, the high priests dressed well when doing their job, including wearing fine linen,

They made tunics, artistically woven of fine linen, for Aaron and his sons, a turban of fine linen, exquisite hats of fine linen, short trousers of fine woven linen, and a sash of fine woven linen with blue, purple, and scarlet thread, made by a weaver, as the Lord had commanded Moses (Exodus 39:27–29).

Now, Jesus functions as our High Priest. If you want to get a peek at what He wears, read Revelation 1.12, 13, and if you want to get an idea of His appearance, keep reading in Revelation 1.