Does that dress look like middle-schooler dress from the 1950s? That's what I was going for. Technically, I guess Mary Marvel is from the late 1930s, but what's a few decades.
Quick thinking from Phantom Lady to preserve Mary Marvel's secret ID. Although, she doesn't wear a mask. Also, technically, when she turns into her superheroine alternate form, she just turns into an older version of herself. So someone could probably use an app on their phone to computer-reverse age her and then figure out who she was.
If only she had glasses, that would thwart any attempts at revealing her identity.
Boilerplate:
The Real Superheroines of Hive Valley is a webcomic about a reality television show following the lives of seven public domain superheroines that all live together in the same mansion in the elite community of Hive Valley.
You can read the series from the beginning ---> HERE.
Drawn in Clip Studio Paint Pro on a Surface Pro 4. Here is the time lapse video: