Sometimes. Pants are always optional...especially on commando Wednesdays. I always go pantless for the frog's legs.
As everyone said, no dress code per se but it's downtown so most people are dressed well. One thing to note, they only take cash or Amex...
No - casual neighborhood kind of feel.
It's nice but not fancy. Like other foodie places, you may get better service if you are well dressed.
No, as dressy or as casual as you like. (Shirt and shoes).
Get quick answers from Alta staff and past visitors.