Curiosity: Rav Yisroel Belsky writes (Shulchan HaLevi 1:1:4) “A garment made from a net is not considered a beged and is exempt from tzitzis. A proof for this is from the Mishna in Keilim (28:9) which says, ‘Ha’oseh beged min hacherem tahor.’ The Raa”v there explains ‘min hacherem – from a net, and his flesh is visible. Therefore he is tahor.’…………..this beged is exempt from tzitzis, and if he made tzitzis on it, there is no kiyum mitzva, and if he wears it on Shabbos, there is an issur hotza’ah.”
Ad kan leshono.
Mistama he probably also holds that if someone makes a beracha on it, it’s a beracha l’vatala, another serious issur.