A more thorough explanation:

COLLOBIUM

Collobium is a hood or covering for the shoulders that was worn by serjeants-at-law in the past. It is a term used in Law Latin.

Example 1: The serjeants-at-law wore collobium as a part of their official uniform.

Example 2: The collobium was made of black silk and had a white fur lining.

These examples illustrate how collobium was a specific type of clothing worn by serjeants-at-law. It was an important part of their uniform and was made of specific materials such as black silk and white fur lining.