#5 - "Rowdy" Roddy Piper: Hot Rod!
If you were to ask any given person to describe "Rowdy" Roddy Piper, you'd probably get something like this - he's a long-haired guy in a kilt and a white shirt that says "Hot Rod!" on it.
Roddy Piper was pretty much never seen without his trademark t-shirt. Seriously - if you do a Google Image Search for "Rowdy" Roddy Piper, he's wearing it in pretty much all of them. Because he wore it so frequently, it became one of the most instantly-recognizable t-shirts in all of professional wrestling.
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Because kayfabe was very much alive and well in the 80's, his shirt wasn't exactly flying off the shelves at first. It took a little bit of time for Piper to get on the fans' good graces, but once he did, more and more folks started buying "Hot Rod!" shirts in droves.
This shirt is one of the many notable examples of "less is more," in that it wasn't too flashy, but it was effective whether he was a heel or a babyface. To this day, it remains one of the most easily-identifiable pro-wrestling shirts of all time.