This is actually my 2nd version and more refined edit—highlighting my experimentation with the core visuals from Punisher’s classic comic book outfit, and trying to reimagine it to sort of seamlessly fit within the greater MCU, and the more typical Avengers-level suit designs you see in the movies.

This isn’t to say he necessarily needs it; I don’t think Frank would ever actively seek for a “superhero suit”, and he is definitely not a traditional superhero. However, I do see Frank as being incredibly resourceful and adaptable, and in situational moments—if the opportunity ever presents itself and he wants to gain the advantage, I don’t think he would outright reject some upgraded gear.

I can imagine some possible scenarios: like for sentimental reasons; if he were gifted the suit from someone very close, if Frank needed proper protection to help protect the streets from another alien invasion or world-ending threat, or a scenario similar to the Thunderbolts (New Avengers)—where Frank has to unwillingly don a new government endorsed/sponsored look.

In the comics, Frank has donned the War Machine amour, and has even become Franken-Castle (Frankenstein’s monster)—all very crazy, and outlandish situations for just a regular man—a regular man who’s ambition drives him to enforce his own twisted vision of justice against an unfair world infested with superhumans and gods.
[Fan Edit] My modernized take on what Punisher might look like if he were ever forced into a more comic accurate suit/upgrade.. I added the attachments that make the teeth & mixed elements from DCU’s Vigilante to get the white gloves/boots