I've had this pair of trousers in my collection for many many years among other British Hospital Blue Clothing, but never did any proper research about them.
As the colour blue is much lighter than the RCAF-shade blue/grey, I suspect these are the canadian version of the British "Hospital Blues Trousers".
I've never seen Canadian made Hospital Blue Clothing and tried to google it, but with no results.
Can anybody confirm where these pair of trousers were used for???