We had to wait a while to Caitlin in full Killer Frost gear, but it was well worth it for this sleek and sexy costume. Head to toe leather sure keeps out the cold, doesn't it?

Actually, Danielle Panabaker's tough, rocker-inspired look and attitude suggests she can serve up ice cold shade in real life too.

When Laurel picked up the Black Canary mantle from her sister, we were whether the costume would remind us too much of Sara and not enough of Laurel's new spot on the team. Those fears were unfounded since she made this disguise all her own.

She's adventurous and fearless on the red carpet too.

Felicity Smoak needs no mask or hood to get her job done, since she's safely behind the scenes of her computer in the Arrow Cave. Still, Felicity has a signature look with her adorkable glasses and stylish mini dresses that win her a spot on this list - and we wouldn't exactly say no to full on suiting up if the occasion called for it.

Sartorially, the CW star straddles the line between put-together and comfort, suggesting she's got a sensible approach to style.

She flew off into the sunset in the Legends of Tomorrow Season 1 finale, offering up one last view of her sensual and curvy leather jumpsuit, topped off with an alluring headpiece.

On Earth, Ciara goes for athletic wear and attitude that flaunt her toned physique.

Down at Assassin Mart, you can find this one in the section marked DO NOT COME FOR ME.

The California-bred dancer and model makes bold choices when she goes to her closet, reveling in designer rags with cool shapes and textures.

Yeah, a plain parka counts as a costume, and while this nondescript ensemble is true to the comic books, Captain Cold really does look like any of the 700 people hailing a cab in Manhattan in winter.

Thankfully, the Prison Break alum puts much more thought into his clothing, often cleaning up real nice in men's style magazines.

Netflix's Daredevil costume has been roasted by fans for everything from its design, its color (deemed to familiar to The Flash) to the ways it wouldn't allow someone to do parkour in real life. Uh, nice helmet?

Outside that suit, sergeant of the Facial Scruff Army Charlie Cox wears a warm, everyman look that's chill and welcoming.

Shout out to this will.i.am video look.

Like many Brits, Franz puts thought into his swag and likes to make statements with different shapes, colors and patterns.

Arrow's costume designer Maya Mani did the redesign for this jade jumpsuit, taking care to give him tougher shoulders and free sleeves to stay truer to the source material. Let's just forget that mask of green goo ever happened.

Actor Stephen Amell maintains a rugged, outdoorsy-type dude appearance -- even in a suit.

Oliver Queen's kid sister left an indelible mark in her red hood she wore to destroy her foes.

She's good at playing bad, and looking badass too.

James Olsen shines in all-silver on Supergirl -- a controversial choice for some fans -- but his headpiece and shield give him an intimidating exterior, even if he does look a little like Robocop.

This man could literally wear a coat of dirty socks and still look great, don't @ us.

Here's Iron Fist practicing fancy moves in what looks like Sunday brunch sweats, and his green and and yellow tracksuit on The Defenders is equally chill.

The London native is a natty dresser and a veritable prince compared to Danny Rand.

Now this is a costume: green skin, a rigid red suit and cheekbones a supermodel would die for.

A fan of sharply cut suits, the Brit actor could be another contender for James Bond.

A breakdown of Jessica's costume -- everyday street clothes that represent her denial of her own abilities -- could be the stuff of graduate school thesis material, but suffice it so say her armor conveys how tough and smart she is.

The raven-haired actor certainly knows the importance of a standout look: she got her start as a print and runway model.

Bringing Vixen from animated to live action came with the huge challenge of not screwing up her costume, and The CW mostly got it right, putting Megalyn in a form-fitting (but not pervy!) black and white suit that's less obsessed with the actor's (amazing) body and ability to mimic any animal on Earth.

Off screen, her secret power is slaying every scene and carpet with maximum glam.

In another win for CW's superhero costumes, Kid Flash's much anticipated garb complements The Flash's, invokes speed with lines and sharp cuts and gives Wally a singular touch: vibrant yellow.

Once a fan of everyday athleisure-type clothes that made him look like one of the wholesome, boy-next-door kids in a PacSun poster, Keiynan has been getting more adventurous and even androgynous as of late, experimenting with guyliner, colored hair and more. Cool!

Luke's bullet-hole ridden hoodie carries loads of meaning -- the sweatshirts becoming, for many African-Americans, a wearable symbol of injustice after teenager Trayvon Martin was killed in Florida in 2012. Luke's is stylish too; it could totally pass for a Yeezy original.

Jealous of that suit? Don't deny the thirst; it's real.

Spartan's monochromatic black ensemble, made to protect John Diggle's identity, is continually evolving, having already undergone upgrades by Cisco to enhance visibility. Definitely wanna cross the street if you see a guy dressed like this pass on the sidewalk.

Spartan's revolutionary-ready wear is the total opposite of the sharp, nice-guy suits the guy who plays him steps out in.

Not a huge stretch, tbh, to see Dominic Purcell rocking Mick Rory's goggles and protective suit -- he looks like Dominic Purcell doing some messy yard work -- but the attire is true to the pyromaniac's story.

When not fanning flames, The Prison Break and CW star likes to flex his enviable pecs, abs and other perfectly proportioned, protein-rich parts.

Designer Kiersten Ronning made sure that the CW's very modern Supergirl looked smart and strong in her updated costume, which dials down old-school T&A in favor of a muted, sophisticated uniform that helps her get her job done.

Melissa's style is pretty breezy even when she's not flying, as it happens; she likes to wear feminine and flowy clothes, and it works.

Hard to know who exactly could be inside the suit worn by The Atom, the billionaire vigilante who designed his crazy powerful (and, ok, kinda sexy) exosuit.

Serial superhero Brandon Roth is super unassuming when not rocking armor or capes, preferring simple, classic apparel that draws attention to his supermodel face and physique.

Wearing the ultimate speedster's distinctive maroon gear, Grant Gustin looks ready for anything in the costume designed by Colleen Atwood. It's super functional: it's stretchy, it unzips easily and it's in that eye-catching color so that it reflects light at the right angles.

The Glee alum Grant Gustin favors a lazy Sunday look featuring comfy threads outside the Arrowverse.

In Amazon's iteration of The Tick, the costume got an upgrade from its Fox days -- with the superhero rocking a more muscle-y shell in a richer shade of blue. Serafinowicz has said interviews like this one with Vice that the suit was a nightmare to wear, calling it suffocating...among other things that won't be printed here.

The English comedic actor is a chameleon, able to go from red carpet suited and booted to authentic hipster in seconds flat.

In his Vibe costume, a multi-colored leather number that looks like it could work for a rap star on tour, Valdes looks ready to manipulate time and space and look badass while doing it.

In real life, the musical theater whiz and The Flash star keeps it casual with lo-key duds and an amazing mane of luscious hair.

Outside of Black Lightning's suit, Cress Williams kinda resembles a grown-up Tyler the Creator.

When Black Lightning makes it to the screen in 2018, he'll be wearing a costume in black and blue -- with a high tech twist. Created by Laura Jean Shannon, who did costumes for The Jungle Book and Blade: Trinity, Black Lightning's suit will light up at night to reflect his energy levels. He'll glow in blue when full of vitality, and yellow when he's depleted, so viewers have a reminder that he's mortal and capable of being hurt.