Never been to Teppan or Mamma Melrose, but I have been to Ohana and CM. I do not ecall there being a specific dress code, as most people prolly head there from the parks so they would be in casual clothes, tennis shoes, sandals, etc. Now when I have eaten at say Cali Grill, I was told outright that the dress code was business casual. So I think if there is a dress code, they will tell you upfront. I hope this helps!