When you consider the time of The Merry Wives of Windsor, there are really three things you are considering:- The setting of the script;
- The time we are setting this production;
- The time the script was written.
Purists (oh, how I loathe them) cry fowl when directors update a Shakespeare script. They think that it is a bespoulment of the good works of a master. I would say to them The Lord Chamberlain's Men and The King's Men did the exact same thing during Shakespeare's time. They kept their actors in modern, Elizabethan dress, especially for the history plays. Why should we be any different?