Functionality is a key thing, and as David F. Sandberg told The Film Riot Podcast, that involves a lot of trial and error.
This makes sense, and I can’t imagine the majority of superhero costumes we see onscreen are identical to the original designs.
Finding the right balance of making everything work while still looking cool and staying true to the character is the challenge with designing a superhero costume.
It sounds like the original Shazam gauntlets hindered Zachary Levi’s maneuverability, and we certainly don’t want a magical hero onscreen whose boots are falling apart.