Just for a Talmudic perspective concerning Tzniut {Modesty} WebShas provides the following index of topics:
http://www.webshas.org/ishus/tznius.htmModesty in Gender Mixing and Sexual Matters
Having a divider between groups of men and women: Succah 51b-52a
Preventing too much intergender socialization, to prevent adultery: Eruvin 53b; Nedarim 20a
Prohibitions against observing or staring at women or certain sections of their body: Nedarim 20a
For males to Sleep "Perakdan" [generally assumed to mean Supine]: Berachot 13b
For males to avoid looking below their belt: Shabbat 118b
Flogging for a groom who sleeps/stays in his in-laws' house: Kiddushin 12b
Keeping the area below the belt covered, when changing clothing: Shabbat 118b
How much skin exposure is considered "ervah": Berachot 24a
Differentiating between "ervah" of a Jew and of a non-Jew, or not: Berachot 25b
A man ought not gaze at a woman's small finger: Berachot 24a
A man exchanging money with a woman in such a way that he will end up gazing closely at her hand: Eruvin 18b
Whether the buttocks are considered "ervah": Berachot 24a
Whether public hair is considered "ervah": Berachot 24a
Whether the 'shok' part of the leg is considered "ervah": Berachot 24a
Having a yeshiva student stay in the home of a female hostess: Bava Metzia 71a
At what age children should not be seen by their parents unclothed: Berachot 24a
Having a widow keep a dog: Bava Metzia 71a [and see Tosafot "Lo"]
Men sitting near the mikvah as women enter to immerse: Berachot 20a
Privacy about knowing which night a woman is immersing: Berachot 24a
Looking at a Bride during her first week of marriage: Ketuvot 17a
For males to walk behind females: Eruvin 18b
Better for a man to walk behind a lion than behind a woman; better behind a woman than behind an idol: Eruvin 18b
A man who walks behind a (Rashi - married) woman in crossing a body of water loses his share in the next world: Eruvin 18b
Bathing brothers, father and son, father-in-law and son-in-law, step-father and step-son, brothers-in-law, Rebbe and student, together: Pesachim 51a
Sitting on the bed of a non-Jewish woman: Berachot 8b; Pesachim 112b
Modesty of a wife in front of her husband: Shabbat 140b
Modesty of husband and wife in requesting sexual relations: Eruvin 100b
Standing unclothed before a light: Pesachim 112b
Keeping a separation between the heart and the lower genitalia: Berachot 24b-25a
A Torah Scholar ought to lie if asked about his sexual habits: Bava Metzia 23b
Giving clothing to one's host to launder: Shabbat 140b
Not watching women come up from the laundry: Makkot 24a
For a woman to own a male eved ivri or eved kenaani: Bava Metzia 71a
One should not sleep in the same room as a husband and wife, even if the wife is menstruant: Eruvin 63b
Relating the laws of modest dress to the sin in the Garden of Eden: Eruvin 100b
What Rav Ada bar Ahavah did when he thought he saw a Jewish woman wearing an immodest garment in public: Berachot 20a