Mistake? He came, didn't he?

So are the Turtles.

In fact, the trench coat is the most clothes they usually wear. Just running around with their cloaca flapping in the breeze.

Fun fact...did you know normal (as in, non-human sized mutant) turtle penises can be as large as 30cm? Could you imagine four nude, teenage, human-sized turtles running around Manhattan with a footlong dick flailing around?

Probably much larger since the rest of their bodies scale up, and, as teenagers, they are at the peak of their virility.