I'm packing a nice pair of slacks, a polo shirt, and a sports coat for our meal at the California Grill. I realize that's a little on the far end of "business casual," but I think dressing up makes it more special. Are they honestly letting people in with t-shirts and flip-flops? I think it would miff me to see that.
Here's what Disney's web site has to say:
Dress Attire is Business Casual
Men: Dress slacks, jeans, trousers, or dress shorts, short or long-sleeved shirt with a collar required. Jackets are optional.
Ladies: Jeans, skirts, or dress shorts with blouse or sweater, or a dress required.
Not permitted in dining room: tank tops, swimming suits or swim suit cover ups, t-shirts, hats for gentleman, cut offs, or torn clothing of any kind.