Not sure about best, but my vote for worst has to go to Zaran the Weapon Master, an obscure 70’s era Shang Chi villian. He’s shown up a few times since then, usually to be laughed off by whichever hero is nearby.
Leather pants, a sort of He-Man/bondage chest harness, and a goofy leather half-mask with his bright red ponytail poping out the back. Even among Chi’s fairly goofy rouge’s gallery, Zaran’s dedication to looking like an ass was commendable. He looks like a rejected He-Man villan design.
Wonderman’s green and red integral-sunglasses abomination was way up there in the bad costume contest too. Actually, ALL his many, many costumes have been terrible, except for his “workout gear” look breifly when he got his own series. Which wasn’t actually good, just not terrible.
Bolt Crank definaty gets a vote. How many layers of green cloth can you put on? And that’s forgiving the Buddy Holly sunglasses and that weird watch cap thing.
And, of course, that’s discounting all the costumes that are supposed to be terrible, like Ultra-Man.
Best . . . I liked Nomad’s look when he got his own comic, not spandex, but enough over-the-top touches (Like that big, “N” belt buckle) to it to show his superhero origins. Longshot’s wierd black “I am the 80’s” outfit thing was pretty cool. I liked the simple original X-Factor costumes (solid colors with a big white X over the middle) And Priss’ orignial Hard Suit, of course.
Hey, Wonderman was very clear on what his pockets contained. His passport, wallet, and keys.
No pockets in spandex, so you need belt pouches or whatever.
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“The slack-wearing superhero!”