tianya and sinster, aodao did got some influence from qipao such as the collar but it didn't derived from qipao. Look at the dress of your ethnic Jing in China, still pretty similar to aodai. And the Jing migrated to China in the 14th century.



Two key features: the slits at the waist and the flowly flaps are still there. Differences are the collar and the flaps. Lord Nguyen Vu Vuong turned the four flaps into two flaps by moving the button line to the side, but at that time ao dai didn't have that "qipao collar". The qipao collar only developed in the 20th century under the influence of China, yes. But today there are many types of collar for aodai, it doesn't have to be the qipao-type collar, like this dress

For references, these are collar types for aodai in the past. Notice that qipao collar came along pretty late
No collar

low ao tu than collar


Qipao collar - This is in the 1960s

Today when designing old-type aodai, designers still make it collarless or low collar
Also for references, this is how ao tu than looked when it got turned from four flaps to two flaps (this happened in the North before Lord Nguyen Vu Vuong) but with the skirt unchanged

Notice the collar in the two pictures above are pretty similar to the ones in these pictures


What changed was the skirt and the sash. They replaced skirt with pants and took away the sash.
P/S: an advice to tianya - you should stop talking in a condescending tone if you want to earn respect from people.