Use this for questions that specifically relate to Queen's Counsel, Senior Counsel, or Senior Advocate, a class of experienced and eminent lawyers in various Commonwealth jurisdictions around the world.
To get or take the silk is the informal phrase for being awarded the title of King's, Queen's, or Senior Counsel, and these members are colloquially called silks.
The selection process for membership varies between jurisdictions, but are generally awarded on the basis of merit rather than a particular level of experience.