Source for tearing clothing: Moed Katan 15a
Tearing where one isn't related: Moed Katan 24b
Although we rule leniently in issues of Mourning, we Don't in issues of Tearing Clothing in Mourning: Moed Katan 26b
For the death of a Torah Scholar even though there is no blood relationship: Shabbat 105b, Moed Katan 25a
For one's Rebbe: Bava Metzia 33a
Defining "Rebbe" status for laws of Tearing clothes in mourning: Bava Metzia 33a
For a good person [Adam Kasher]: Shabbat 105b, Moed Katan 25a
For one who is present at anyone's moment of death: Shabbat 105b, Moed Katan 25a
For a grandchild: Moed Katan 20b
Tearing the clothing of a Minor who is a Relative, to induce others to mourn for the deceased: Moed Katan 14b, 26b
Tearing clothing for News of a relative's Recent Death where the news came on Shabbat and after Shabbat it will be in the category of "Distant News": Moed Katan 20b
Tearing for in-laws, in respect for one's wife: Moed Katan 26b
Tearing clothing as long as one is involved in eulogizing the deceased: Moed Katan 25a
Tearing Clothes in Grief
Tearing for bad news, and repairing such a tear: Moed Katan 26a
The "bad news" tearing is if affects the majority of the populace: Moed Katan 26a
Upon seeing the ruins of Jerusalem, and repairing such a tear: Moed Katan 26a, 26a-b
One tears for the Above upon reaching Mt. Scopus: Moed Katan 26a
Upon seeing the ruins of the cities of Judea, and repairing such a tear: Moed Katan 26a, 26a-b
Upon seeing the ruins of the Temple, and repairing such a tear: Moed Katan 26a, 26a-b
Adding on to one's tear torn over the Temple, if he then sights the ruins of Jerusalem: Moed Katan 26a Elisha tearing his clothes over Eliyahu's departure, although he wasn't dead, because he would never see him again: Moed Katan 26a
Procedure
Tearing before a sick person: Moed Katan 26b
How a woman tears: Moed Katan 22b, 26b
How the Head Kohen tears: Moed Katan 26b
Tearing is to be done at the moment of emotion: Moed Katan 24a
Tearing clothing later during the 7 Mourning days and beyond: Moed Katan 20b, 24a
Tearing borrowed clothing, where the lender knew that the borrower was likely to enter a mourning situation: Moed Katan 26b
Tearing while standing: Moed Katan 20b-21a
Tearing while hidden from public view, for general relatives and for parents, and for the leader of the Jewish people: Moed Katan 22b
Tearing by hand or with the aid of an implement, for general relatives and for parents: Moed Katan 22b
Tearing an area adjoining the collar or separate, for general relatives and for parents: Moed Katan 22b
Tearing an area which was torn and then repaired to some extent: Moed Katan 26b
Degree of tearing, for general relatives and for parents: Moed Katan 22b, 26b
Degree of tearing for multiple dead, where one of them is [not] a parent: Moed Katan 26b
How many times one may add to an earlier tear for additional deaths: Moed Katan 26b [2x]
Tearing all layers of garments, or merely the uppermost, for general relatives and for parents: Moed Katan 22b
Tearing the bottom or side of a garment: Moed Katan 26b
Tearing a hat-scarf: Moed Katan 22b
Tearing clothing if one changes it, during the week and on Shabbat: Moed Katan 24a
Refusal to Tear
One who simply wears a garment which was torn beforehand is stealing from the dead and from the living: Moed Katan 26b
Uncovering the Shoulder from beneath the Garment
Uncovering the shoulder where one isn't related: Moed Katan 24b
Manner of uncovering the shoulder for a Leader of the Jews, Chief Justice, or Torah Scholar: Moed Katan 22b
Baring the shoulder for the death of a Torah Scholar even though there is no blood relationship: Shabbat 105b, Moed Katan 25a
Baring the shoulder for the death of a good person: Moed Katan 25a
Baring the shoulder if one is present at anyone's death: Moed Katan 25a
For deceased parents or other relatives: Moed Katan 22b
For a leader ["Nasi"] of the Jewish people: Moed Katan 22b
Repairing the Torn Garment
Repairing a tear torn during the 7 days after the initial emotion: Moed Katan 24a
Repairing a tear torn for a parent: Moed Katan 26a
Repairing a tear torn for a "Nasi" - Leader: Moed Katan 26a
Repairing a tear torn for a Chief Justice: Moed Katan 26a
Repairing an extra tear: Moed Katan 26b
Flipping the garment upside down and re-sewing it: Moed Katan 26b
Turning the torn part around, or re-sewing it, for general relatives and for parents: Moed Katan 22b, 26b
Turning the torn part around, or re-sewing it, for a tear torn for the death of a Torah Sage: Moed Katan 22b, 26a
What to do with the torn clothing on Shabbat: Moed Katan
24a
For a purchaser of the garment to repair it: Moed Katan 26b
