Only fashion item I know in Vietnamese culture is the Ao Dai. Ao Dais are these lovely pantsuits worn by women. They are these flowy pants worn with lovely long tunics. Some even wear those conic hats that I forget are called. As for seeing these outfits, their street style seems to be a lot like some of the style that I've seen here in Houston. Just not sure about the first two pictures in Post #3 as far as seeing anything similar to what's in Houston. Then too, Houston has the largest Vietnamese population in Texas, and third-largest in the United States. So some of these styles I've seen before from some Vietnamese that I've come across. I'm reminded of the peep-toe slingback flats worn by the lady in the third picture of Post #3. One femme I've seen at my community college wore these quite often. She even wore black stockings with those similar shoes and wearing shorts with them.
Maybe since I'm from Houston and know a good number of Vietnamese people, I'm a bit reminded of Ha Noi style in this thread. Thanks to you all for showing off Ha Noi style to me.