Why in the white unbrella the narrator say the car is a convertiable?

In "The White Umbrella," the narrator refers to the car as a convertible to highlight its luxurious and stylish nature, which contrasts with her family's modest means. The convertible symbolizes a world of privilege and freedom that she yearns for, emphasizing her feelings of inadequacy and desire for acceptance. This detail also serves to underscore the themes of social class and identity throughout the narrative.