I still see a lot of bare-chested superheros after the Code! Namor the Sub-Mariner, the Hulk, Ben Grimm...
And then there were the ones with just token straps across their chests but otherwise bare-chested - Hawkman, Martian Manhunter, Marvel's Hercules.And that does not even count the ones with plunging necklines and cut-outs. Or the exhibitionist heros like Sgt Fury or Shang Chi, who had tops but tended to lose them and fight bare-chested at every opportunity.
Link to the book:
Thrilling Comics 04