Mishnayos Nedarim Perek 7 Mishnah 3

For one who vows that a garment is forbidden to him, it is permitted to wear sackcloth, and to wear a sheet, and to wear a coarse curtain [ḥamila], as these are not in the category of garments. For one who said: Wool is konam for me and I will therefore not place it upon myself, it is permitted for him to cover himself with wool fleece, which is not considered a garment, and it is prohibited for him to wear only a woolen fabric. For one who said: Flax is konam for me and I will therefore not place it upon myself, it is permitted for him to cover himself with uncombed flax in bundles, and it is prohibited for him to wear only a flaxen fabric. Rabbi Yehuda says: Everything is determined according to the one who vows. If one was bearing a burden of wool and linen, and was sweating, and its smell was unpleasant for him, and in reaction, he said: Wool and linen are konam for me and I will therefore not place them upon myself, it is permitted for him to cover himself with wool and linen garments, but it is prohibited for him to sling them over his shoulder behind him as a burden. The circumstances of his vow make it clear that he intends to forswear carrying wool and linen as a burden rather than the wearing of them as a garment.

הַנּוֹדֵר מִן הַכְּסוּת, מֻתָּר בְּשַׂק, בִּירִיעָה, וּבַחֲמִילָה. אָמַר קוֹנָם צֶמֶר עוֹלֶה עָלָי, מֻתָּר לְהִתְכַּסּוֹת בְּגִזֵּי צֶמֶר. פִּשְׁתָּן עוֹלֶה עָלָי, מֻתָּר לְהִתְכַּסּוֹת בַּאֲנִיצֵי פִשְׁתָּן. רַבִּי יְהוּדָה אוֹמֵר, הַכֹּל לְפִי הַנּוֹדֵר. טָעַן וְהִזִּיעַ וְהָיָה רֵיחוֹ קָשֶׁה, אָמַר קוֹנָם צֶמֶר וּפִשְׁתִּים עוֹלֶה עָלָי, מֻתָּר לְהִתְכַּסּוֹת וְאָסוּר לְהַפְשִׁיל לַאֲחוֹרָיו: