Reference for Bava Kamma 238:10

ת"ר אין לוקחין מן הצבע לא אותות ולא דוגמות ולא תלושים של צמר אבל לוקחין מהן בגד צבוע טווי בגדים השתא טווי שקיל בגדים מיבעיא מאי בגדים נמטי

It is not right to buy from a weaver either remnants of woof or of warp or threads of the bobbin or remnants of coils. It is however allowed to buy from him [even] a chequered web,<span class="x" onmousemove="('comment',' Lit., 'garment'. [Although it apparently consists of remnants of different materials which he might have acquired unlawfully, for even so the ownership of them was transferred to him by the change in substance.] ');">⁴</span>

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