Generally women here stick to their own kind in public.
If you want to try a mall you can try out Vincom, but Saigon Square has a lot of shopping and may work better.
These women definitely get dressed to impress (slutty) even if they are conservative.
They show a lot of skin and many will look like hookers.
Sexy Vietnamese girls are some of the hottest in Asia, but they are not the easiest for foreign men to hook up with.
This post on how to meet and date single girls in Ho Chi Minh City will hopefully be able to help you out.
However Lush might have more hookers than the others on this list.