fwm: Some of this info may be useful:
Most original 1897's are in well worn condition. So finding one that won't need some work, could be problematic. There are some good ones out there, though. Depending on what province you're in, be sure to check out any cowboy action club sites. Many will have a buy/sell section. If in Ontario, for example....check out the OSASF site. You might luck into a good, used 1897.
If an 1897 clone may suit, check out Marstar. The shop lists Norinco-made 1897 pumps in stock. May be worth a look.
As far as clothes go, many folks pick up plenty of bargains at thrift shops, etc. But for "period correct" clothiers, here are a few that may be of interest: Wild West Mercantile. Frontier Classics. Historical Emporium. Hornaday Dry Goods. Just to name some of the top ones.
It's worth mentioning that a very simple and basic cowboy outfit can consist of a pair of jeans, long-sleeved shirt. Boots(Can be work boots....but no lug soles). Plus, a suitable cowboy hat. This basic set up will be suitable anywhere. Though most folks will still prefer to dress as authentically, as possible.
As far as gun leather goes...my advice is simple: Buy the best quality leather you can afford. That way, you're getting best quality, durable and long lasting gear, that will last for years and hold up well under hard competitive use. The cheap stuff will always fail, at the worst possible time.
Here are some good sources: Mernickle. Kirkpatrick. El Paso Saddlery. Doc Noper. These are some of the top names in cowboy gun leather. U.S. Makers, but do ship to Canada. There are other custom makers. But, these should give you a good idea what to look for.
For further information on cowboy gear, etc., be sure to visit the Single Action Shooting Society main site. Plenty of good info there.
I recently came across this Canadian source: Leatherworks. Canada. Shop is located in B.C. Have no first hand experience with any of their products, so can't comment further. Still, may be worth checking out.
Another good Canadian source: The Last Best West. A variety of products. Including: Hats, leather gear, etc.
As a rule, targets (steel plates) are close. Commonly 10 meters (33 ft), or sometimes closer. Depends on the province, state, etc. The plates will also be fairly large, too. So easy to hit, even for raw beginners.
Hope this info is useful:
Al