Further...
Further, revealing the clothes he was wearing underneath, he said that the outward attire is just for the view of the world but underneath he was coarsely dressed for the sake of his soul. Materials which are not permitted to be worn: Men are not permitted to use pure silk and brocade and are asked to be careful that their headgear and all those clothings which do not cover the private parts should not be made of silk. Even certain accessories of clothing, like borders, frills etc.
should only be made of artificial silk, cotton or any cloth, where silk is one tenth of the other yarn used in the material. Cloth made of any yarn except silk is preferable. Non-essential parts of clothing like handkerchief, shawl etc. can be made of silk.
It is better for children who have not come of age, to be stopped from wearing pure silk and gold; as according to the tradition of the Holy Prophet (s.a.w.a.) as narrated by Hazrat Ali (a.s.), the Prophet had asked Ali (a.s.) not to wear a golden ring and silk as he would be dressed in silk in paradise and decorated with gold. Though Ali (a.s.) never used to wear these but it was an indirect address to the people.
Some persons had asked Imam Ja'far-e-Sadiq (a.s.) whether they could dress their children in gold. The Imam (a.s.) ordered them to refrain from using gold themselves and dressing their children (not having come of age) in gold; only their women and (female) slaves could use it. Instructions about cotton wool and artificial silk: It is narrated by Ameer-ul-Momineen, Hazrat Ali (a.s.), that cotton and woolen cloth should be used, as the Holy Prophet (s.a.w.a.) and Ahle Bait (a.s.) wore them.
The Holy Prophet (s.a.w.a.) used woolen cloth when required. There is a tradition related with Imam Ja'far-e-Sadiq (a.s.) from Husain Ibne Kaseer who saw Imam Ja'far-e-Sadiq (a.s.) wearing a woolen cloak over coarse cloth. After praising the Imam (a.s.) he asked why he wore the woolen over coarse as he thought the woolen to be abominable (makrooh).
The Imam (a.s.) replied that his ancestor, Imam Zainul Abedeen (a.s.) used to wear coarse cloth while praying and therefore the Ahle Bait did likewise. Colours of the dress which are sunnat or makrooh It is related from the Holy Prophet (s.a.w.a.) that white colour is the best and suited to men who should also be provided with a white winding sheet. Tradition According to a tradition from Imam Ja'far-e-Sadiq (a.s.) he saw Hazrat Ali (a.s.) buying three clothes for a gold coin.