Yeah the purple outfit will always be a hard sell.
What's funny is the Phantom ( who pretty much set the mold for superhero attire.
Was originally conceived as an all gray clad character, as per his name and theme- The Gray Ghost (AKA the Ghost Who Walks)
Which worked great for the B&W daily strips. And even black and white film.
It wasn't until he later branched out into the Sunday Papers, that they (King Feature) insisted Lee Falk choose a really bright standout color for the costume! after Supeman debuted and became popular, so he would stand out among the Sunday color pages.
Hence he ended up Purple.
Also if you look at international versions of the character, going off the gray dailies, they all imagined and chose their own color to represent the character on their covers.
Which all except gray somewhat went against the whole theme of the character.
(also the Batman animated series Gray Ghost character takes his name as a reverse nod)
If they ever pursue The Phantom again in live action they should just chose a very de-saturated color, almost gray. Or intirely gray with only some slight purple piping.