Buffy's baggy jeans

Why is Buffy wearing baggy jeans and a sweatshirt at the end of Acathla Part 2 when she leaves Sunnydale ? I understand the idea of showing her in casual clothing for the bus ride, but we're talking about someone who fights vampires and demons in skirts and heels. It just doesn’t quite add up, haha! And why does she have this baggy in her wardrobe at the first place. She is still beautiful though!

Why is Buffy wearing baggy jeans and a sweatshirt at the end of Acathla Part 2 when she leaves Sunnydale ? I understand the idea of showing her in casual clothing for the bus ride, but we're talking about someone who fights vampires and demons in skirts and heels. It just doesn’t quite add up, haha! And why does she have this baggy in her wardrobe at the first place. She is still beautiful though!