Hi, Tobi!
With the exception of Victoria & Albert's, which has a fairly strict dress code, most of the signature dining restaurants on Walt Disney World property ask for a "Business Casual" or "Resort Casual" dress code.
Disney states that for its signature dining, "Dress Code for Signature Restaurants is Resort Casual. Not permitted in dining room: Tank tops, swimsuits or swimsuit cover-ups, hats for gentlemen, cut-offs, torn clothing of any kind, or t-shirts with offensive language and/or graphics."
What is welcome:
Men: Khakis, slacks, jeans, dress shorts, collared shirts. Sport coats are optional.
Ladies: Capris, skirts, dresses, jeans, dress shorts.
Victoria & Albert's defines its proper attire as:
"Men: Dinner jackets with dress pants/slacks and shoes. Ties are optional (Please no jeans, shorts, sandals, flip-flops, or tennis shoes)
Ladies: Cocktail dress, dressy pant suit, skirt/blouse or nice dress. (Please no jeans, shorts, capri pants, sandals, flip-flops or tennis shoes)."
Have a wonderful - and delicious! - meal!
See you later, celebrator,
-Deborah B.