'Linen' in the Bible

I looked up and saw a man clothed in linen; around his waist was a belt made of gold from Upaz.

One said to the man clothed in linen who was above the waters of the river, "When will the end of these wondrous events occur?"

Then I heard the man clothed in linen who was over the waters of the river as he raised both his right and left hands to the sky and made an oath by the one who lives forever: "It is for a time, times, and half a time. Then, when the power of the one who shatters the holy people has been exhausted, all these things will be finished."