In the picture you can see a young Vietnamese girl on the way to school. Female students wear this white uniform on certain days of the week. I think it is on Mondays and Fridays. Younger female students wear the uniform every school day. Bicycles are still the most frequent way of transportation in Hue. Motorbikes are catching up quickly.
By the way, renting a bike is an excellent way of visiting the city. Ask your hotel.