‘Allamah ‘Ali Qaari رَحْمَةُ اللهِ تَعَالٰی عَلَيْه states regarding modesty:

وَھُوَ  خُلُقٌ  یَّمْنَعُ  الشَّخْصَ  مِنَ  الْفِعْلِ  الْقَبِیْحِ   بِسَبَبِ  الْاِیْمَانِ

i.e. Modesty is the trait that prevents a person from committing evil deeds due to Iman [faith]. (Mirqat-ul-Mafatih, vol. 1, pp. 140; Taht-al-Hadees: 5)

Rulings of modesty

Author of the commentary of Sahih Bukhari, ‘Allamah Maulana Mufti Muhammad Shareef-ul-Haq Amjadi رَحْمَةُ اللهِ تَعَالٰی عَلَيْه has stated: At times, observing modesty becomes Fard and Wajib; such as observing modesty from a Haraam and impermissible action. At times, it becomes Mustahab [preferable]; such as observing modesty in abstaining from a Makruh Tanzeehi. And at times, it becomes Mubah [permissible]; such as observing modesty from performing a Mubah-e-Shar’i [i.e. such an action that Shar’iah has declared it to be permissible]. (Nuzhat-ul-Qaari, vol. 1, pp. 334)

Connection of modesty with the environment

Dear Islamic brothers! Environment and upbringing play a vital role in spreading modesty. One’s modesty develops further if he is blessed with a modest environment. Whereas, company of immodest people makes a person immodest, taking the purity of his heart and eyes away. Due to this, a person indulges in countless immoral and impermissible affairs. It was the blessing of modesty that stopped a person from committing sins and evil actions. When modesty is removed, then what will stop us from committing evil actions?

There are several people who do not commit evil actions fearing the embarrassment of being defamed. However, those who do not care about being defamed, such immodest people end up committing every sin, cross the bounds of morality and end up being immoral, and do not even feel embarrassed to perform those actions that are against the human ethics. Whereas, righteous servants of Allah Almighty are not only an embodiment of modesty, but modesty is embedded into every vein and drop of their blood.