Reference for Shabbat 115:18
אמר מר לא תצא בהמה לא בחותם שבצוארה ולא בחותם שבכסותה ולא בזוג שבצוארה ולא בזוג שבכסותה זה וזה אין מקבלין טומאה
The Master said: '[He may] not [go out] with the bell around his neck, but he may go out with the bell on his garment.' Why not with the bell around his neck; [presumably] 'lest it snap off and he come to carry it: then also in the case of the bell on his garment let us fear that it may snap off and he come to carry it? — The reference here is to one that was woven [sewn] into it. And [this is] in agreement with R. Huna the son of R. Joshua, who said: Concerning whatever is woven they enacted no prohibition.<span class="x" onmousemove="('comment',' I.e., if something is woven into a garment, it may be worn on the Sabbath without fear of its falling off. V. supra 57b. ');"><sup>17</sup></span>