>>95895122This. Stormtroopers worked very well as a design because they had a distinctive and menacing silhouette that was easily identified, while still being universal enough to be worn by any trooper. The suits were bright white and shiny which made them pop against dark and metallic ship interiors and, as a badguy faction suit, they literally have a scowl.
Contrast that with Darth Vader specifically and they're the perfect underlings for the sith lord's fit. His is fancier, but is a cross between the armored imperial troopers and the cloth and robes of the jedi. His helmet is more knightly with a samurai kabuto helmet influence, but matches the scowl of the troops. His is also black, but also still shiny and glossy, so they feel like they're the same material and manufacture.
All iterations on storm-trooper armor and costuming are based on these fundamentals for each environment they're found. Awkward or goofy is not actually a problem if you simply take them seriously: the armor IS clunky as a fact, but it is on purpose. They clomp about when they march and contrast the heroes lighter and more heroic fits, while Darth Vader is big and slow not because he can't go any faster, but he's simply not in a hurry. Either way the effect that has on scene composition and worldbuilding is evident: underlings clatter into a room, one of them bumps their head on the door and their master comes gliding in behind them, still heavy-set and armored, but like a posessed armor gliding across the ground.
This is a lot of words to say: There's nothing wrong with stormtrooper armor and if you're looking to make something for your games, you should be taking notes rather than trying to "fix" it.