Hi Pam.
For all months of the year we recommend taking clothes that can be layered. This allows for any changes in weather conditions that you may experience.
In September you should enjoy mostly warm days and cool evenings so light-medium weight clothing would be suitable. You'll also be touring though some mountain landscapes so we would recommend a few warmer items too. And, although most of Canada can enjoy the warmer weather, make sure you pack at least one waterproof top in case it does rain.
Ayria took this trip earlier this year and wrote a great review here:
http://www.justyou.co.uk/forum/thread-66980.html
Clairevt travelled in September last year:
http://www.justyou.co.uk/forum/thread-58353.html
These will give you a rough idea of what to expect. In terms of shoes - I would suggest a pair of sturdy, comfortable shoes.
Hope all of this helps.
Kindest regards,
Julia