Jude – once again, there is no Mesora. No Rav I have spoken to or heard of maintains that this is a Chiyuv. How could it be, if there are big Machloksim among the Rishonim (Rashi – Rambam, for example), and this can only be Kosher Techeiles according to one at the most?
Therefore, if one wears it b’Tzinah on one Beged, let’s say, while having in mind to be Yotazei Al ha’Tzad, then he has gained the possible fulfillment of this Mitzvah while losing nothing,