It is worth stressing here that wearing non-pure silk (50% silk and 50% other fibers) has no religious backing to prohibit it. This is what is clear in what was said by Sheikh Muhammad Saleh Al-Munajid, a prominent Saudi Islamic lecturer and author. It goes as follows:
“If there is a tangible health reason for a person to wear silk, to relieve the suffering, wearing it is permissible in that case. This is based on the Hadith narrated by Anas, may Allah be pleased with him, that the Prophet, peace and blessings of Allah be upon him, allowed ‘Abd Ar-Rahman Ibn ‘Awf and Ibn Az-Zubayr, may Allah be pleased with them both, to wear silk because they suffered from a skin irritation. (Reported by Al-Bukhari, 10/295, and Muslim, 3/1646).
The scholars also allowed men to wear garments containing four fingers’ width of silk, because of the Hadith of `Umar Ibn Al-Khattab, may Allah be pleased with him, who said that the Prophet, peace and blessings of Allah be upon him, forbade the wearing of silk except for an area the width of two fingers, or three or four (meaning a small amount of silk that equals two, three, or four close fingers). (Reported by Muslim, 3/1644)”
In the light of the above Fatwa, it becomes crystal clear that only small amount of silken material in man’s clothing is permissible. Needless to say that 50% is not a small amount. But, we have to keep in mind the fact that although there are some jurists who do not consider it Haram to have a small amount of silk or a small amount of silken material in men’s clothing, it is still better to avoid pure silken neckties, gloves, etc., in obedience to the Prophet, peace and blessings be upon him, who told us that men should not wear gold and silk.