Since my bar mitzva I’ve worn a woolen beged on Shabbos and YomTov and cotton during weekdays. But that’s a personal chumra, although many men and boys do have that same chumra. It is not a chasidic custom as many chasidim will wear cotton and polyester on Shabbos too. A lot depends on peer customs and peer pressure. Especially in yeshivos.
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