We ate at LC in April wearing jeans, t-shirts and sneakers. We hurried over from MK to make the ADR on time so were a bit sweaty as well....

Hubs' t-shirt had a collar, but only by accident. I was wearing a plain Mickey T.
Here's a link to the dress code for signature restaurants. LC isn't on this list, but it may need updating.
http://www.wdwinfo.com/tips_for_touring/dress-code.htm#Restaurant
~For the Signature Dining Restaurants, a "Business Casual" dress code is in effect:
Men - Dress pants, jeans or dress shorts and a T-shirt or long sleeve shirt with collar is required. (Jackets optional.)
Women - Jeans, skirts or dress shorts and blouse, sweater or dress is required.
NOT PERMITTED: Tank tops, swim suits or swim cover ups, hats for gentlemen, cut offs or clothing with rips/tears are not allowed. T-shirts with offensive language/graphics will also not be permitted.
The Signature Restaurants are:
Artist Point, Bistro de Paris, California Grill, Citrico's, Citrico's Chef's Domaine, Flying Fish, Fulton's Crab House, Il Mulino, Jiko's, Narcoossee's, Portobello Yacht Club, Shula's, Todd English's bluezoo, Wolfgang Puck Dining Room and Yachtsmen Steakhouse. ~
We have ADR's for Bistro d2 Paris in 2 weeks and will wear jeans since we will be in the parks all day. I'll try and wear a fancy Mickey T.
