Finally i tried this shoes, fit from the first try. Nice design with easy slip on. A bit roomy on the top, but you can change the shoe lace if you want (it comes with traditional shoe lace in the box). I had freet pace, and compare to pace i feel you can move more free in tanga, probably because the elastic ankle in tanga.
Haven't try this for running (I'm not a runner, but I was running 14km in pace, and it was fine). For walking, it's totally fine, no issue at all. I wear the same size in tan...