as you know ah, because i'm here for work so not really go shopping much ah. the few times i did, i went to those 2. russian market lesser tourists, they sell many winter wear, some bags, quite a lot of sports apparel also. i bought stuff there before.
saigon square is a lot more touristy but i think if you're up for fake luxury goods you can go there. many stores taken over by korean lol. u can hear them mostly speaking in korean to entice korean shoppers.
Ben thanh is pretty basic. i prefer to go in the day for more options compared to at night. my friend bought the northface backpack here. sorry i can't recall how much cos quite long ago. but cheaper than the cheapest fake in carousell.