There might be an inyan I believe to have Tallaism cleaned or washed for Rosh HaShanna and for Pesach.
Tallaism, in my humble opinion shouldn’t be worn for Kiddush after davening on Shabbos/Yom Tov, only for Tefilla.
Tallaism should be worn for Mincha (but that’s another thread altogether — no pun intended).
Shticky Guy — Tallaism are not D’Var Sheb’Kedusha. They are D’Var Shel Mitzvah. Tefillin are D’Var Sheb’Kedusha.
Some have the practice to buy a new Tallis at a lifecycle event — Bris Mila, Chassuna of a child, birth of a grandchild.
Twisted — very interesting. On a related topic, it is know that the late Satmar Rebbe, Rav Yoel Teitelbaum, ZTVK”L would wear the same kittel on Yom Kippur as the one he wore on Pesach Seder night. The Kiddush/Matzah/Charoset stains would “act as a defense attorney in front of the Heavenly Court” of his involvement in Mitzvohs here below.