The right outfit for a job interview would be "el traje".
Explanation:
The right outfit for a job interview would be "el traje". Un traje in Spanish means "a suit" in English. Of all the options provided, it's the best one to wear in a job interview. The others are not suitable. "La sudadera" means sweatshirt. "La gorra" means the cap, and "la camiseta" means shirt. They are all way too informal for a job interview, specially if it's in a big corporation where appearance is really taken into account.
