Etiquette of Dressing & non-permitted materials Part 2

Materials Which are not Permitted to be Worn:

Allama Majlisi; Book Tehzeeb-ul-Islam, second blessing 

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 Imam 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.