She was wearing white "Ao Dai". White Ao Dai is normally uniform for high school girls.
Riding motor cycle is still rare and bicycles are more popular for high school students.
People normally keep their bags in front of motor cycles rather than putting those in the front basket to avoid bag-snatching.
Girls fold rear panels of Ao Dai to avoid getting them stucked into the wheels.
After School from flickr
Ao Dai Viet Nam
by flickr pool