Halacha Tzitzit visible. Kabbalah T”K covered. See S”A 8 11
& Mishna Berura 25 & 26 to save a trip to your bookcase here is a link http://www.hebrewbooks.org/pdfpager.aspx?req=14170&st=&pgnum=27&hilite=
“Minhag” of some Lubavitcher youth T”K under shirt Tzitzit come out shirt which is not tucked in
for Shulchan Aruch Admur Hazaken see
http://chabadlibrary.org/books/adhaz/sh/sh1/4/8/19.htm
for comments on “minhag” see
http://www.shturem.net/index.php?id=4806§ion=news
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