'Linen' in the Bible

Then Samson said to them, “Let me now propound a riddle to you; if you will indeed tell it to me within the seven days of the feast, and find it out, then I will give you thirty linen wraps and thirty changes of clothes.

But if you are unable to tell me, then you shall give me thirty linen wraps and thirty changes of clothes.” And they said to him, “Propound your riddle, that we may hear it.”