'Changes' in the Bible

Then Samson said to them, “Let me now ask you a riddle; if you can tell me what it is within the seven days of the feast, and solve it, then I will give you thirty linen tunics (undergarments) and thirty changes of [outer] clothing.

But if you are unable to tell me [the answer], then you shall give me thirty linen tunics (undergarments) and thirty changes of [outer] clothing.” And they said to him, “Ask your riddle, so that we may hear it.”

Then the Spirit of the Lord came upon him mightily, and he went down to Ashkelon and killed thirty of them and took their gear, and gave changes of clothes to those who had explained the riddle. And his anger burned, and he went up to his father’s house.