Here's a vintage unused 1980s Batman T Shirt, Made by Polar Bear Sportswear in Canada, 100% white cotton, size large. Printed only on the front, it has the cover of Batman #37 with the Joker and it says Licensed Classic Comic Covers By Polar Bear Sportswear Under License DC COMICS #DC 0706 1988 NC-B-9.
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I got an auction lot of 1980s unused first quality super hero t-shirts (one of each style), still in plastic bag packaging and this is just one of several Ebay listings for them.

 As always, all my offerings may be returned for a refund if you wish (buyer pays shipping unless I have misrepresented).