Quoting Commentary for I Kings 22:30

Shaul disguised himself. He changed his clothes, and similarly, 'disguise yourself [הִתְחַפֵּשׂ] and come into battle,'⁶II Melochim 22:30. and similarly, 'its intensity makes me change [יׅתְחַפֵּשׂ] my clothing.'⁷Iyov 30:18. And so did Targum Yonoson render, 'and Shaul changed.'

is my garment changed My “garment” changes, layer after layer. When a person removes his garments and puts on other garments different from the first ones, he calls these בִּגְדֵי חֹפֶשׁ, like (I Kings 22:30), “I will disguise myself (התחפש) and go into battle.” This is translated into Aramaic by the word אשתני, I will change.

Divrei HaYamim records that Paroh Necho sends Yoshiyahu a non-confrontational message. He does not intend to engage Yoshiyahu in battle. He wishes to merely travel through Eretz Yisrael along the international trade route that cuts through the Jezreel Valley, where Megiddo is located. Yoshiyahu ignores the warnings and confronts the Egyptian forces. Yoshiyahu disguises himself in battle but nevertheless is shot down by the Egyptian arrows. It is of note that an arch-villain of Sefer Melachim, Achav, dies under eerily similar circumstances (see Melachim I 22:30-34 and Midrash VaYikra Rabbah 20:1).