1. It is preferable to wear white clothes
It was narrated that Ibn ‘Abbaas said: The Messenger of Allaah (peace and blessings of Allaah be upon him) said: “Wear white clothes, for they are the best of your clothes, and shroud your dead in them.” Narrated by al-Tirmidhi, 994, hasan saheeh. This is what the scholars regarded as mustahabb. Also narrated by Abu Dawood, 4061; Ibn Maajah, 1472
2. The male clothing must not resemble the female’s clothing.
Prophet Muhammad (may the Lord greet and bless him) severely censured the women imitating men and the men imitating women, for such behavior is alien to human nature ( a hadith narrated by Ahmad, Abu Daud, at-Tirmizhi and Ibn Madja, from Ibn Abbas)
3. It is not allowable for the Muslim man to let any garment he wears hang down beneath his ankles (known as isbaal);
It was narrated from Abu Hurayrah (may Allaah be pleased with him) that the Prophet (peace and blessings of Allaah be upon him) said; “Whatever of the lower garment is beneath the ankles is in the Fire.”Narrated by al-Bukhaari, 5450
4. It is forbidden to wear garments of fame and vanity, which means a garment that stands out from others so that people will look at the wearer and he will become known for it.
It was narrated that Ibn ‘Umar said: The Prophet (peace and blessings of Allaah be upon him) said: “Whoever wears a garment of fame and vanity, Allaah will dress him in a garment like it on the Day of Resurrection
5. It is forbidden for men to wear silk and gold.
Abu Musa Al-Ash`ari (May Allah be pleased with him) reported: Messenger of Allah (PBUH) said, “Wearing of silk and gold has been made unlawful for males and lawful for the females of my Ummah.” (At-Tirmidhi)
Among those who believe that there is reason and wisdom (behind the rulings of Islam) – and they are the majority – are some who answer that Islam has forbidden it so that people will keep away from it and give it up for the sake of Allaah, so they will be rewarded for that. Others reply that it was basically created for women, as is the case with gold jewellery, so it was forbidden for men because it can corrupt them by making them resemble women. Some of them said that it was forbidden because of what it may lead to in the way of pride, showing off and self-admiration. Some of them said that it was forbidden because when it touches the body, it makes a man effeminate and goes against his masculinity and manliness, so if he wears it his heart gains the characteristics of femininity and softness, as is obvious, even if he was the most masculine and chivalrous of men. There is no doubt that wearing silk will diminish these manly characteristics, if not take them away altogether.