A more thorough explanation:

A long robe is a type of clothing historically worn by members of the legal profession, also known as "gentlemen of the long robe." It is similar to a gown and is often associated with judges presiding over court.

In the United States, judges typically wear plain black robes while in the United Kingdom, judicial robes vary in color and adornment depending on the judge's rank, the season, and the court. They are traditionally worn with white horsehair wigs.

The term "robe" can also refer to the legal or judicial profession as a whole, including its members who are considered eminent or distinguished.

For example, one might say "The judge donned his long robe before entering the courtroom" or "She has dedicated her life to the robe, serving as a respected member of the legal profession for over 30 years."

These examples illustrate how the term "long robe" is used to describe a specific type of clothing worn by judges and other legal professionals, as well as how the term "robe" can be used more broadly to refer to the profession itself.