Women's dress in Ontario

Two articles from the 1960s published by the Royal Ontario Museum have just become available through the Internet Archive. They may be helpful if you're trying to date an old photograph from a woman's attire.

Women's costume in the early Ontario by Katherine B Brett describes and illustrates what women were wearing from approximately 1784 to Confederation in 1867.
The same author produced a longer work on the succeeding period Women's costume in Ontario, (1867-1907).

Don't forget that while dress may be quite a good guide in dating a photograph of a younger woman, they usually wanted to look fashionable, a more mature lady may have been happy to continue wearing styles from earlier years.