What era of time is benny from supernatural's clothes based on?

Benny, a character from "Supernatural," is often seen wearing clothing that reflects the early to mid-20th century, particularly resembling styles from the 1940s and 1950s. His casual yet rugged attire, including flannel shirts and denim, aligns with the post-war American fashion of that time. This choice emphasizes his character's backstory as a vampire from the 1940s, providing a visual link to his past and enhancing his rugged, old-fashioned persona.