Hi --We ate at Tchoup Tchoup for dinner last August and I would say Khaki Pants and a Polo is a totally appriopiate outfit. I think my husband wore something like that I know I wore a casual skirt with sandals but I think if you went for lunch you could get away with shorts. Anyway the food was the best we had that week! Service was just incredible we had 3 waiters for my family of 4. The only thing bad about the restaurant is that it is much smaller than I expected and the tables are very close to one another, we sat in a booth by the lily pond and I would definetly request a booth if I went again! Have a great time and enjoy!