Take off this suit
He references the suit earlier in the song. “And I’ve got this black suit on, roaming around like I’m ready for a funeral"
In an effort to wash of the darkness of the "black suit” He’s purifying himself by ridding himself of his sins.
As he frees himself, he could also be ridding himself of the weight that the broken hearts reference previously have put upon him.
This can also mean Frank is going to show his true self by taking off the suit he wear daily by keeping his emotions inside. He will go show himself to renew.
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