The Tzitz Eliezer has a T’shuvah (one of the first few Simanim in either Chelek 8 or 18, I think) that discusses why one is always obligated to wear Tzitzis. He has another T’shuvah (I don’t remember where, maybe in Chelek 21) that explains that undershirt Tzitzis could actually be quite problematic. I would be very hesitant before making a Baracha on them after I saw that.
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