the gemara menachos basically says you need techeiles (unless the garment is ripped)
Menachot 39b implies that a silk garment doesn’t need techeiles because its only derabanan
the ramban said ‘R’ Zerachiah HaLevi did not wear any tzitzit his whole life’
Meor is on the rif 11b shabbos (rif daf)
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