Jessica Chastain rocks a jumpsuit at The Good Nurse premiere at Toronto International Film Festival

Jessica Chastain set temperatures soaring when she graced the red carpet at the world premiere of her new film The Good Nurse in a matching crimson jumpsuit.

The 45-year-old Oscar winner added a healthy dose of style to the Toronto International Film Festival with her outfit, which was sleeveless and highlighted her fit arms.

She stars in the true-crime thriller The Good Nurse, playing a struggling single mother trying to stay afloat with her demanding career as a nurse at a New Jersey Hospital.

She initially strikes up a good rapport with a new nurse (played by Eddie Redmayne), but after several of her patients who seemed to be improving die under unusual circumstances, she comes to suspect him of foul play.

Jessica’s chic red-carpet look featured baggy pant legs that reached all the way to the ground, completely covering her beige platform heels.

The slim top emphasized her trim figure, and the sleeveless design featured slim jeweled straps.

She turned around to reveal that the straps ran together over her exposed back, culminating in a jeweled ring. 

Creepy: She stars in the Netflix film as a nurse who begins to suspect her new colleague (Eddie Redmayne) may have a connection to the unusual deaths of her patients

Covered up: Jessica’s chic red-carpet look featured baggy pant legs that reached all the way to the ground, covering her beige platform heels

Glittering: The slim top emphasized her trim figure, and the sleeveless design featured slim jeweled straps

Showing off: She turned around to reveal that the straps ran together over her exposed back, culminating in a jeweled ring

Jessica wore her red hair pulled back into a bun, with curling strands left danging to frame her impeccably made-up face.

Supporting her at the premiere at the Princess of Wales Theatre was her costar Eddie Redmayne.

The Academy Award–winning actor contrasted Jessica’s minimalist jumpsuit with a busy green, black and gray plaid blazer with wide peaked lapels.

He contrasted it with crisp brown trousers, and he paired his white button-up shirt with a slim black tie. 

Redmayne plays Charles Cullen in The Good Nurse, who is responsible for 29 confirmed deaths.

However, the serial killer claimed to have killed as many as 40 people, and some investigators involved in the case believe he may have killed more than 300 people, making him possibly the most deadly American serial killer, according to Charles Graeber’s 2007 New York Magazine story, which was the basis for his 2013 book and, in turn, the film.

Low key: Supporting her at the premiere at the Princess of Wales Theatre was her costar Eddie Redmayne. The Academy Award–winning actor contrasted Jessica’s minimalist jumpsuit with a busy green, black and gray plaid blazer with wide peaked lapels

Spooky: Redmayne plays Charles Cullen in The Good Nurse, who is responsible for 29 confirmed deaths

Horrifying: He claimed to have killed as many as 40, but may have been responsible for more than 300 deaths, possibly making him the most prolific American serial killer

Dapper: The Americans star Noah Emmerich, who plays a detective investigating the patient deaths, looked handsome in a dark plaid suit with a tie-free white shirt

The Americans star Noah Emmerich, who plays a detective investigating the patient deaths, looked dapper in a dark plaid suit with a tie-free white shirt.

Kim Dickens, who is also featured in The Good Nurse, looked glamorous in an elegant black single-shoulder dress with a separate halter collar.

Nnamdi Asomugha, who plays another detective, opted for a more formal look with a black tuxedo featuring peaked lapels, though he skipped a tie.

Blond beauty: Kim Dickens, who is also featured in The Good Nurse, looked glamorous in an elegant black single-shoulder dress with a separate halter collar

Formal: Nnamdi Asomugha, who plays another detective, opted for a more formal look with a black tuxedo featuring peaked lapels, though he skipped a tie

Costars: Jessica looked affectionate as she embraced her young costar Alix West Lefler at the premiere

Seeing green: The young actress wore a lovely quilted seafoam green dress and contrasted it with cool white sneakers

Jessica looked affectionate as she embraced her young costar Alix West Lefler at the premiere.

The young actress wore a lovely quilted seafoam green dress and contrasted it with cool white sneakers.

She also accessorized with a sack-like white texture handbag.

The Good Nurse will be released in US theaters on October 19, followed by a streaming release on Netflix on October 26.

Coming soon: The Good Nurse will be released in US theaters on October 19, followed by a streaming release on Netflix on October 26