question #2 Sahih al-Bukhari 5828, Book 77, Hadith 45 : How did the companions of the Prophet ensure they adhered to his teachings regarding clothing?

While we were with `Utba bin Farqad at Adharbijan, there came `Umar’s letter indicating that Allah’s
Apostle had forbidden the use of silk except this much, then he pointed with his index and middle
fingers. To our knowledge, by that he meant embroidery.