בָּעֵ֣ת הַהִ֗יא דִּבֶּ֣ר יְהוָה֮ בְּיַ֣ד יְשַׁעְיָ֣הוּ בֶן־אָמוֹץ֮ לֵאמֹר֒ לֵ֗ךְ וּפִתַּחְתָּ֤ הַשַּׂק֙ מֵעַ֣ל מָתְנֶ֔יךָ וְנַעַלְךָ֥ תַחֲלֹ֖ץ מֵעַ֣ל רַגְלֶ֑יךָ וַיַּ֣עַשׂ כֵּ֔ן הָלֹ֖ךְ עָר֥וֹם וְיָחֵֽף׃ (ס)
nang panahong iyon ay nagsalita ang Walang-Hanggan sa pamamagitan ni Isaias na anak ni Amoz, na sinasabi: “Humayo ka, at kalagin mo ang telang-sako mula sa iyong mga balakang, at hubarin mo ang iyong sandalyas mula sa iyong mga paa.” At ginawa niya ito, na lumalakad nang hubad at nakayapak.
Rashi
and you shall gird sackcloth over your loins (וּפִתַּחְתָּ) Jonathan renders: “And you shall gird the sackcloth over your loins.” And his interpretation is evidenced by the fact that until now, He had not commanded him to gird himself with sackcloth, that He should tell him to remove it. Moreover, when He tells him, “And you shall remove your shoes from upon your feet,” this is a sign of mourning. (It is, therefore, likely that He commanded him to gird himself with sackcloth, also a sign of mourning.) And the meaning of וּפִתַּחְתָּ is like: (Exodus 39:6) “Engraved like the engravings of a seal (מְפֻתָּחוֹת פִּתּוּחֵי חוֹתָם),” to gird himself with sackcloth tightly on his flesh, so that it appears to be engraved in his flesh.
Ibn Ezra
And loose the sackcloth, etc. This shows that the prophet wore sackcloth. It would be a strange thing that the prophet should have gone naked, as a sign for Egypt. I shall explain this circumstance, with the help of the Lord, at the beginning of the minor prophets (Hos. 1:1).2I. E. explains this as a vision. Isaiah saw in a vision that he was going naked, as a symbol for Egypt; as Hosea saw in a vision himself marrying a harlot, and having children by her, to whom be gave symbolical names as allusions to the fate of his people.
Rashi
naked (עָרוֹם). Jonathan renders: פְּחֵיחַ, with torn and worn out clothing, but not actually naked.