Here's one of many: Navy Bar
56 Đường Huỳnh Thúc Kháng, Bến Nghé, Quận 1, Thành phố Hồ Chí Minh, Vietnam
The girls dress in cute sailor uniforms. There's another bar next to it called saloon where the girls wear cute cowboy outfits.
I used to go to Nguyen Hue walking street, just eat street food and people watch and talk to people. Then once the plaza got quiet around 10 or 11 i'd go to some random girlie bar around the block to drink 333 and do ballons.
Obviously, don't bring your card and keep an eye on your bill. Don't be afraid to say no if a girl asks for a ladydrink.
Another location is Japantown, but it "closes" at midnight: 8A Thái Văn Lung, Bến Nghé, Quận 1, Thành phố Hồ Chí Minh 700000, Vietnam
All these places are ghosttowns now, and all the girls went back to their hometowns in the Mekong.