GMAB
about wearing tsitsis IN/OUT
please see shulchan aruch o.c. 8:11
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also see m.brura [25]about walking among goyim, which seems to be refering only to a danger.
The m.brurah [26] has some strong words about those who hide this great gift [tsitsit] from hashem which hints to hs very name. One should be very proud to adorn it & show it in front of others…