Hard Rock Cafe linked to Intercontinental Asiana Hotel, originally uploaded by andreaban2009.
I managed to enter this shop on the last afternoon just hours before leaving for the airport. I'm not sure whether sizes are universal but I found the T-shirts snug around the waist. ( s/m/L) I tried the T-shirts for men but it looked big and I looked bigger in it. So no, I didn't buy any T-shirt despite trying a few on. HRC is linked to Intercontinental Asiana Saigon. And it's near the Notre Dame Cathedral. That's your landmark. I quite like walking in HCMC it's less humid than Malaysia. The narrow sidewalk and the traffic was a little scary but once you get to the main street, walking becomes enjoyable.