Wa `alaykum as-Salamu wa Rahmatullahi wa Barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
1- Silk and gold are prohibited for Muslim men.
2- Wearing silk is allowed as an exception in case of skin illness that requires using it.
3- Silk is also allowed if it is very small.
4- The above applies to pure natural silk, not artificial silk.
Responding to your question, Sheikh Kifah Mustapha, the Imam and Director of The Prayer Center of Orland Park and representative for Dar El Fatwa of Lebanon in the US, states:
Wearing silk is prohibited for Muslim males as mentioned in the Hadith of the Prophet (peace and blessings be upon him), “Do not wear silk, for one who wore it in this life will not wear it in the Hereafter.” (Al-Bukhari and Muslim)
Allah Almighty mentioned that people in Heaven will be wearing silk, “…they shall be adorned therein with bracelets of gold, and with pearls, their garments therein, of silk.” (Fatir 35:33)
Also the Prophet (peace and blessings be upon him), once held gold and silk in his hands and said, “These two are prohibited on the males of my Ummah.” (Abu Dawud)
Now only in two cases people are exempted:
First, if there was an illness like a skin rash or so and silk will be the best fabric to help skin.
Second, if the amount of silk is very small in relation to the whole garment.
Finally, with such percentage you mentioned of 43%, it would not be permissible to wear silk.
Note: I lean to the idea that only pure natural silk is prohibited and not man-made silk feeling fabric. So if silk is not natural, then it is not prohibited at all.
Allah Almighty knows best.