RCAF Flight gear is very easy to find and relatively cheap:
Flight suits can be sourced off ebay:
Ebay Link
My local suplus store had a whole crate of OD and brown CF Nomex flight gloves the last time I was there. Send them an email and see if they can send a pair out to you:
http://www.supplysergeant.ca/
As for boots you can get away with using surplus cadet boots (The new fake leather boots) as flight boots if you're simply going for the look.
Hope that helps!