The correct answer to this open question is the following.
Although there are no options for this question we can say the following.
The reasons for the change during the Edwardian Era were that new King Edward VII inherited the English throne after Queen Victoria, so one of the firsts things that newly King Edward VII wanted to do was to end with the conservative customs that characterized the Victorian times.
The Edwardian era was a time of costly parties in Buckingham Palace with aristocratic people. The richest and wealthiest people in England dressed in fancy clothes to attend the parties and celebrations.
Guest invested too much money in fashion clothes to be part of these elite gatherings. Regarding sports, hunting was the main sport in the court.