R’ Yisroel Belsky ZT”L wore Tekhelet

Quote from https://www.mywesternwall.net/2017/11/03/top-32-rabbis-and-founders-wearing-tekhelet-techeiles.html

R’ Belsky ZT”L had a complicated relationship with Tekhelet. He likely was influenced by R’ Schachter while working together for the OU. He wore it on his regular Tzitzis when wearing a long frock coat to cover it, as well on his Shabbos Tallis. He didn’t like talking about it much and didn’t wear it on his weekday Tallis. My guess is he didn’t want to face negative backlash from the Haredi community and his affiliation with Torah Vodaas which has gone in “that direction.” This is nothing new: my father told me personally that in his time at Torah Vodaas in the mid-late 1970’s when people were starting to research it, the general attitude was that “this is nonsense.” R’ Yisroel Reisman, who is presently one of the Roshei Yeshiva at Torah Vodaas, has been vocal against it, saying there’s a “zero percent chance” that the murex is the techeiles source (which has been addressed by R’ Aryeh Leibowitz since that lecture). R’ Belsky also told his kids that they don’t need to wear it, and they don’t. Ask any Torah Vodaas alumnus in the last 10-15 years for confirmation on the above.

From OUKosher by Rabbi Eliyahu W. Ferrell:

It used to be that wearing Techeiles (the kind that became available around 1990) was unique to the religious Zionist camp. In recent years, it has made inroads into parts of the Chareidi world; although (I am reliably informed that) Maran HaGaon Rav David Feinstein, Shlita, opposes wearing them, (I am reliably informed that) Maran HaGaon Rav Elyah Ber Vachtfogel, Shlita, does wear them. It is no secret that Rav Belsky wore them.

At the request of a friend’s son, I asked Rav Belsky about his approach to Techeiles. Rav Belsky told me, “It’s the real thing…there are Kama V’Kama Rayos…” When I asked him if he recommends wearing them, he said that, in general, he doesn’t tell people what do, and did not want to become the “public advocate” of Techeiles.
In the sefer Nefesh HaRav, Rav Schachter writes that Rav Soloveitchik opposed attempts to restore lost elements of the Mesorah via scientific or other means. The Chilazon, like any other Cheftza in the Mesorah, must be identified exclusivelyby the Mesorah itself. This, reportedly, was the Beis HaLevi’s objection to the Radziner Techeilis. I asked Rav Belsky about scientifically restoring lost elements of the Mesorah. He said that with solid Rayos, it’s “K’Ilu there is a Mesorah.”

R’ Belsky held like Tosafos, and wore his strings and tying.

Other notable rabbis wear Tekhelet and you can go to https://www.mywesternwall.net/2017/11/03/top-32-rabbis-and-founders-wearing-tekhelet-techeiles.html to see a list of 32 of them.

Rabbi Belsky’s English Haskama to a pro-tekhelet article

I was shown the קונטרוס לבוש הארון on the subject of תכלת – i.e. the identity of the source of תכלת ,the חילזון etc. I have gone through it from beginning to end in a serious manner, and I have examined all of its details and proofs. I have found it to be a complete and necessary work, a great and praiseworthy effort that is worthy to disseminate amongst the לומדי תורה ,and they should pay attention to all the clarifications and sources within it. It would seem that there is also what to rely upon from these words for practical application, or at the very least not to scorn those who have decided to place this תכלת on their garments – since it is not for naught that they have done this – as the matter is correct and חס ושלום
to dismiss it lightly. One who wishes to understand these matters should study the text.
Signed on Purim of the Walled Cities 5773,
Yisroel Halevi Belsky

found at https://www.techeiles.org/library_main/%D7%94%D7%A1%D7%9B%D7%9E%D7%94-%D7%9C%D7%A1%D7%A4%D7%A8-%D7%9C%D7%91%D7%95%D7%A9-%D7%94%D7%90%D7%A8%D7%95%D7%9F-%D7%94%D7%A8%D7%91-%D7%99%D7%A9%D7%A8%D7%90%D7%9C-%D7%91%D7%A2%D7%9C%D7%A1%D7%A7%D7%99/