Help ID a uniform

Hi all,
My stepmother talked about her brother from time to time. They were born in Denver and their father died when she was 3 yrs old (he would have been 2 yrs). She was sent to Nova Scotia to live with her grandparents but never indicated that he was with her. I have an old photo of him in uniform that I believe was in about 14940-41. I don't know if is the US or Canadian. The quality is poor so I am hoping someone can give me a rough idea. One friend thinks it is 101st Screamin Eagles. Another says it is Canadian because of the orientation of the stripes on the arm. Thanks in advance for any help.
Bill

 

Not US. I would say Canadian. Definitely a UK uniform.

 

Agreed with chibobber

 

British 1937 Pattern Battledress uniform.

 

Canadian Grenadier Guards.
Post war as wearing medal ribbons with open collar & tie.

 

Thank you!

 

Thank you! Great info. I can see it now! I can start tracing from here.

 

Thank you, Owen! It gives me a great starting point to track him down!