Reference for Nedarim 7:3
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:
If one bevows himself from "covering," he is permitted (to cover himself with) sackcloth, tent-cloth, and chamilah (coarse stuff) [These are materials especially rough and thick, and people are not wont to cover themselves with them.] If he said: "Konam, if wool come upon me," he is permitted to cover himself with strips of wool. [For he intended only a garment of wool.] (If he said: "Konam) if flax come upon me," he is permitted to cover himself with stalks of flax. R. Yehudah says: All according to him who vows. [i.e., according to the time of the vow. If it is clear that he vowed because of the heaviness of the load, he is permitted to cover himself (with the material he is carrying). The halachah is in accordance with R. Yehudah.] (e.g.,) If he were carrying a load and sweating, and giving off a foul odor, and he said: "Konam if wool or flax come upon me," he is permitted to cover himself (with it as a garment), but forbidden to throw it over his back (as a load).