Elizabeth maintained peace throughout an era of intense religious conflict allowing England to prosper. She presided over the emergence of England as a world power.
On this site she is Queen Elizabeth of England. Today's Queen Elizabeth is Queen Elizabeth of the United Kingdom, a non-existent entity in the 1500s. Today's Queen Elizabeth is Elizabeth I in Scotland.
An outstanding collection of images of Tudor era dress can be found here.
Elizabeth's Wikipedia article can be found here.