The Importance of Hayaa (Modesty) and Satr (Covering) in Islam

All evil in this world stems from waswasa (evil thoughts/whispers), which Shaytan uses to tempt people towards fujur (immorality).
The first waswasa targeted Adam and Hawa, urging them to expose their private parts, causing their natural clothing to fall off.
Hayaa (modesty) is an inborn quality; Adam and Hawa immediately sought to cover themselves with leaves.
A sign of Allah's displeasure is when a person begins to uncover their satr (private parts).
Allah has provided clothing for three main purposes: to cover our private parts, for adornment, and as libas-ut-taqwa (clothing of piety).
Libas-ut-taqwa refers to the fear of Allah and engaging in good actions, which purifies one's inner self.
Wearing clothes is a direct sign from Allah for us to reflect upon His creation.
Reject the excuse of "our forefathers did it" when it comes to immodesty, as Allah never commands immorality.
Even when alone, especially during ghusl (ritual bath) or in private, always strive to cover oneself out of modesty towards Allah.
Prophet Muhammad (PBUH) recommended wearing white clothing for its purity and cleanliness, and also because it's used for shrouds, reminding us of our ultimate return.
For women, wearing pants (trousers under outer garment) and thick head coverings/scarves is encouraged for modesty and protection.

Summary