I made a post like this in the “Other Media” section but this is a top 10 and just for comic costumes. My top 10 are…
No Man’s Land Batman
Batman Beyond
“Hush” Batman
New 52 Superman
Reign of Superman Black Suit
Rebirth Deathstroke
Classic Hal Jordan Green Lantern
John Stewart
Omega Lantern Kyle Rayner
Classic Flash(Barry Allan)
Flashpoint Batman
Godfall Superman
New 52 Superman
New 52 Batman
Batman Beyond
New 52 Red Robin
New 52 Solstice
Gotham By Gaslight Batman
Red Son Superman
Red Son Deathstroke
Wally West’s Flash suit #50-150 2. Batman Year One Batsuit. 3. Tim Drake’s first Robin suit Batman (#457) 4. Booster Gold’s Second fiberweave suit (Action Comics #124) 5.Green Arrow’s Neal Adams suit 6.Martian Manhunter’s Brightest Day suit 7. Aquaman’s spear hand look 8. Ice’s New costume (Justice League #84-90) 9. Hector Hall’s Dr. Fate suit 10. Katar Hol’s Post Zero Hour suit
My list of “Perfect-And-Can’t-Be-Improved-Upon” costumes includes:
Dr. Fate: the helmet, the cape, the unique shade of blue… simple and effective.
Hal Jordan: the version with the green sections that extend onto the shoulders.
Ted Kord: perfect and Spider-Man-esque.
Jade: her original Infinity, Inc. costume.
Aquaman: Blue/camouflage costume (probably difficult to draw, but it’s still a beautiful design).
Tim Drake: 1st Robin costume (a perfect updating of Dick Grayson’s original look).
Cyborg: Vic’s original Perez design.
Halo: her original costume with the ribbons of color against the black (another costume that’s probably to draw, but looks great when drawn well).
Supergirl: her 80s/COIE costume with the headband, red shoulders and yellow accents.
Hawkman: a hawk helmet, a harness and a mace… that’s all he needs.
A few more obscure choices:
Black Orchid: it’s a strange design, but also visually compelling.
Captain Atom: his short lived costume that only appeared in The Law, a mini-series from the late-90s that no one seems to remember.
Tarantula: the All-Star Squadron character.
Various Legionnaires: Mon-El, Lightning Lad, Sensor Girl, etc.