tallit katan
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a “hair” shirt ????
But God doesnt shoot you if you take it off ....
“a “hair” shirt”
No. Just an undershirt with Tzitzit be added to the four corners. (Some Orthodox wear it on top, which I equate with beating your chest and saying how pious one is.)
The Torah states in Numbers 15:38: “Speak to the children of Israel, and say to them, that they shall make themselves fringes on the corners of their garments throughout their generations, and they shall put on the corner fringe a blue (tekhelet) thread.” Wearing the tzitzit (plural: tzitzyot) is also commanded in Deuteronomy 22:12, which says: “You shall make yourself twisted threads, on the four corners of your garment with which you cover yourself.”
There are many, many theological reasons for this, but the practical one is to remind you of G-d’s Law before you take off your pants and get yourself into real trouble.