Saul disguised himself; both because he was ashamed to be known, or thought guilty of this practice; and because he suspected that the woman, had she known him, would not practise her art before him.
Related Commentaries of 1 Samuel 28:8
1 Samuel 28:8
8 And Saul disguised himself, and put on other raiment, and he went, and two men with him, and they came to the woman by night: and he said, I pray thee, divine unto me by the familiar spirit, and bring me him up, whom I shall name unto thee.