It's your choice of attire. One doesn't pick clothes like yours over the more practical, modern ones available. Familiarity is the only thing that wins over practicality when it comes to fashion.

[ Style too, but a person can be stylish whether in older or modern clothes. Style is more of a personality matter than an aesthetic one, she thinks. Shizuka is into fashion more than she cares to show, but she feels comfortable enough to show a glimpse of that here. She's in a good mood, after all. ]