#3 - Hulkamania
HONORABLE MENTION: Hulk Rules
The "Hulkamania" shirt was easily the most popular wrestling shirt in the 80's. And rightfully so - Hulk Hogan was, without a doubt, the most famous pro-wrestler in the world at the time. Everyone wanted to be like Hogan. They wanted to have the tanned skin the 24-inch pythons, so they said their prayers, ate their vitamins and wore this shirt.
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Back then, pretty much every wrestling fan had this shirt. Hell, even non-wrestling fans wore it around because it was so hip.
Even today, despite the fact that Hogan hasn't wrestled for WWE full time in over 15 years (or at all in over 11 years), you'll regularly see Hulkamania shirts in the crowd. Sometimes, you'll even see a full-on Hulk Hogan cosplayer, decked out in his Hulkamania shirt, feather boas, a Hulkamania headband, the works.
Even though WWE has been distancing itself from Hulk Hogan in recent years because of his racist comments, I have faith that Hulkamania will run wild once again in the WWE. And when it does, they'll officially re-release this shirt. And when they do, it'll fly off the shelves once again.