'Linen' in the Bible

And Samson said to them, "Let me tell you a riddle. If you can fully explain it to me within the seven days of the feast, and find [it out], I will give to you thirty linen garments and thirty festal garments.

But if you are unable to explain it to me, you must give me thirty linen garments and thirty festal garments." So they said to him, "Tell your riddle; let us hear it."