They make cheap white 1 piece coveralls for the workplace. Disposable yet pretty tough. Oil and water proof and you can buy a pack of 4 for about $12.95.
That is the way I would go. Get all the warmth and comfort from my camo gear and just throw the XX Large 1 piece over the top.
I assume in Saskatchewan you will be hunting in a blind so, camo is not necessary.
Check the paint store or equipment rental places.
They wear these suits in many industrial settings.
Good luck and by all means, take pictures. Let us know about the regulations and what you ultimately use.
Teach a kid to respect wildlife, then teach a kid to hunt and fish.