I remember reading on MC's Taurus 1 page the best shoes for playing were flat and hard-soled. I don't have organ shoes, but my brother used to work at a bowling alley and stole some bowling shoes! And they work quite well.

But, I don't mind playing with bare feet either.
So what's your preference?
I think, as a right-handed bass player, my left foot might work the best as that's kind-of my stance while playing. I find using my right tends to move my bass around a bit much, but this is perhaps due to my developing skill set.