Keilim28: 8
בִּגְדֵי עֲנִיִּים, אַף עַל פִּי שֶׁאֵין בָּהֶם שָׁלשׁ עַל שָׁלשׁ — הֲרֵי אֵלּוּ טְמֵאִין מִדְרָס. טַלִּית שֶׁהִתְחִיל בָּהּ לְקָרְעָהּ, כֵּיוָן שֶׁנִּקְרַע רֻבָּהּ — אֵינוֹ חִבּוּר. הֶעָבִים וְהָרַכִּים — אֵין בָּהֶם מִשּׁוּם שָׁלשׁ עַל שָׁלשׁ.
[Concerning] clothing of poor people, although they do not measure three [fingerbreadths] by three [fingerbreadths], they [can become] tamei with midras [tumah]. [Regarding] a cloak that one began to tear, once a majority [of the cloak] is torn, [the torn parts] are no longer [considered to be] attached. Thick [cloths] and soft [cloths] are not subject to the law of three [fingerbreadths] by three [fingerbreadths].
Keilim28: 9
כֶּסֶת הַסַּבָּלִין — טְמֵאָה מִדְרָס. מְשַׁמֶּרֶת שֶׁל יַיִן — אֵין בָּהּ מִשּׁוּם מוֹשָׁב. סְבָכָה שֶׁל זְקֵנָה — טְמֵאָה מִשּׁוּם מוֹשָׁב. חָלוּק שֶׁל יוֹצֵאת הַחוּץ הֶעָשׂוּי כַּסְּבָכָה — טָהוֹר. הָעוֹשֶׂה בֶּגֶד מִן הַחֵרֶם — טָהוֹר, וּמִזּוֹטוֹ — טָמֵא. רַבִּי אֱלִיעֶזֶר בֶּן יַעֲקֹב אוֹמֵר: אַף הָעוֹשֶׂה בֶּגֶד מִן הַחֵרֶם וּכְפָלוֹ, טָמֵא.
A porter’s cushion is [susceptible to becoming] tamei with midras [tumah]. A wine strainer is not subject to [the tumah] of a seat. The hairnet of an old woman is [susceptible to becoming] tamei with midras [tumah]. The shirt of a harlot that was fashioned like netting is not susceptible to tumah. [If] one makes a garment out of a fishing net, [it] is tahor, but if [he made it] out of [the net’s] bottom, it is tamei. R’ Eliezer ben Yaakov says: Also [if] one made a garment out of a fishing net and he doubled it, it is tamei.