How did dress circle in a theatre become to be known as such?

The term "dress circle" originated in the 19th century, when theatres began to introduce a new seating area between the orchestra stalls and the upper circle or balcony. This area was originally known as the "first circle" or "grand circle", but it was eventually renamed the "dress circle" as it was considered the most fashionable and prestigious seating area in the theatre.

In the early days of theatre, the dress circle was reserved for the upper classes and wealthy members of society. It was a place where people could see and be seen, and where they could display their finest clothing and jewellery. The dress circle was often the most expensive seating area in the theatre, and it was typically sold out well in advance of performances.

Over time, the dress circle has become less exclusive, and it is now open to people of all backgrounds. However, it still retains its reputation as a desirable and prestigious seating area, and it is often the place where celebrities and other VIPs sit during theatre performances.

The term "dress circle" is still used today in many English-speaking countries, but it is also sometimes called the "mezzanine" or "balcony".