WWI and WWII Trousers and bags

Hey guys,
Got lucky at an auction and picked up a bunch of trousers and things.
In the lot was WWII CDN shorts, WWII CDN khaki trousers(looks like he did some post war painting in these in pants), WWII CDN Motorcyclist trousers, WWI trousers and the white pair I believe are WWI Summer weight trousers but I'm not 100% on those yet.
There was also a kit bag maker marked and dated 1918, a small pack which has some modifications made to it....I could use some input on it. I've searched Karkee Web and my books and can find similar but not the same. Would also be interested in peoples opinions if the strap modifications were military or civilian post war.
Also a pair of puttees were included with the lot.
Was pretty happy with the purchase, it was listed as old riding gear.

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Great find bravo.
For the pants it reminds me has a antique BSA - Boy scouts Uniform Pants.
But I can make a mistake

Pack is a P16 Canadian. Belt straps removed and replaced with what looks like an Oliver 1899 Haversack shoulder strap. Has P08 fittings attached... See the one I have for sale in the marketplace for a comparison.

Ypres