On Conviction, Atwell plays the morally questionable former First Daughter Hayes Morrison. But one thing that's never in doubt is her keen fashion sense, as evidenced by her decision to pair this conservative navy dress with bold fuchsia pumps.

The actress put a fresh spin on cutouts when she wore this navy dress with sheer polka dot panels.

As the titular lead of Agent Carter, Atwell often married ultra-femme 1940s style with more masculine items, creating a look that is uniquely her own.

Atwell's teal trench in the Conviction is the ultimate fall goals.

Forget skinny jeans! Atwell's wide-legged jumpsuit on Agent Carter is what we should all be stocking our closets with.

The actress' real-life wardrobe is often just as playful as her costumes, such as this floral-embellished, long-sleeved black dress.

When her character attended an important gala on Conviction, Atwell wore this classically sexy red dress, but paired it with a delightfully unexpected sequin jacket.

This Agent Carter outfit could easily veer into costume territory, but the proportions on Atwell's striped hat, puffy sleeves and A-line skirt are so perfectly balanced, anyone could pull off this look, onscreen or off.

Atwell's bright blue top and navy slacks on Conviction prove that work wear doesn't have to be boring.

Puffy sleeves. High waist. Wide-legged pants. A peach blouse. There is a lot going on in this Agent Carter look, but somehow Atwell makes it look simple.

This green trench Atwell wore on Conviction is simple, chic and to die for.

As Atwell proves here, red carpet dresses don't have to show a lot of skin to stand out.

In this promo shot for Conviction, Atwell could have easily looked like a cater waiter on a smoke break. But her relaxed styling of these traditionally masculine pieces instead makes her look like the ultimate Cool Girl.

Although one would think a bulky blazer, chunky belt and massive lapels would overwhelm Atwell's frame, the Agent Carter actress took a risk here, and it seriously paid off.