When Jonathan made a covenant with David, what did he give him?

Answer: His robe, sword, bow, and belt

Jonathan gave David the robe he was wearing, along with his tunic, sword, bow, and belt (KJV: girdle).

“Then Jonathan made a covenant with David because he loved him as himself. And Jonathan removed the robe he was wearing and gave it to David, along with his tunic, his sword, his bow, and his belt.”— 1 Samuel 18:3-4 (BSB)