I like to ask questions.  So I want to preface this by saying I like superhero RPs and this seems like a fun idea.  Tons of folks here like Superhero RPs and a good dozen at least are well in to OC Superhero RPs.

That said, it might help to flesh things out a bit more.

Is this a Modern Age type setting or like 1950s or Future?

How did Jefferson (is that a first or last name?) find out about these people?

With superpowers being unknown to the world at large and superheroes being non-existent, it would seem, what are you imagining for villains?

What sort of genre are you going for?
You say Old School Costumed Adventure with Skin Tight Suits, but also crime, grime, corruption, and custom superhero suits and weapons.  Are you thinking like 1960s/70s Batman Camp (think Adam West Batman and that weird Robin) or the 90s Batman the Animated Series (think Noire with a lot of Mafia villains and troubled villains) or like Spiderman/X-Men sort of more Standard Issue Comic Book stuff.  Or hell something like Marvel Knights which is closer to Grim Dark (think more violent, more killing, more twisted villains and drug use or other adult stuff)