"Warlord" (garment) for the Qin and Han Dynasties popular wear, this is the short one.
This is a long Warlord
Did you see the difference? The answer is at the end of this page.
"Ruqun" for the Tang Dynasty popular wear. They are different in their collars and sleeves. This one is the collar straight with the elbow-length sleeves.
This is cross collar with the elbow-length sleeves.
This is another tribe of Ruqun, called coat skirt
This is the Flat collar with the elbow-length sleeves. This collar looks like the round neck but more flat as a rectangle.
This is the Chest-hight collar with the long sleeves.
"Beizi" for the Song Dynasty popular wear
ANSWER
1. The long and short Warlord are different in the end of their
garment. The short one
has a skirt inside, but the long one doesn't.