Most scanned images will have the copyright on them. Someone selecting the "He's Back" image from an old house ad for a personal tee-shirt makes more sense than an official release. 

There have been countless comic book related t-shirts that have mostly been sold through the Direct Market since, at least, the 1980s.Before it became "hip" for the mainstream to wear Marvel and DC character t-shirts they can find at Wal-Mart and Kohls for under $10, fans were purchasing such shirts from comic shops for $15 or more dollars when no place else carried them.

So, that noted... I think the shirts Nathan posted about were those distributed through Diamond, Capital, and other 1980s comic distributors.

Obviously, this is NOT JB's art, but...

When did Captain Marvel become a member of Alpha Flight?? Did I miss something?

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I have no memory of that house ad...? 

Here's a pic of the shirt in the original packaging -- 

Here's a close up of the tag -- "Screen Stars" produced these shirts in the 80's -- 

It doesn't exist. Like you, I also would have remembered such a house ad.