Ruqun (襦裙) is a set of attire in hanfu which consists of a short jacket worn under a long skirt.
An aoqun is the opposite; hanfu where the top is worn over the skirt (not tucked in).
Ruqun is however a very broad term, an umbrella term for any kind of hanfu wherein the top is tucked into the skirt. Try to use one of the more specific terms below. Use ruqun when none of the below categories apply.