As a prior poster noted: BOTH the Main Dinning Rooms and the Theater are pretty chilly. And back in the day people did dress "up" more ... not the tux / suit / jacket to every dinner ... but those were "expected" but not enforced on Formal and Semi Formal nights. Today its almost anything goes

So wear what you want.
But to put the Dinner Close discussion to bed years ago (didn't work

) I created this list YEARS and YEARS ago ....
Looking at this "list" it, it's amazing how much
DCL has changed with regards to dress code for dinners over the past 20 years. (because all of these items were brought up - and never in a good way)
And I did not even mentioned Jeans back then (dress, skinny, normal, low riders (plumber), ripped (stylishly or just old!) )... because well, just NO! (back then). Jeans are now very common to see in the MDR's.
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THE Clothes Hierarchy
The
Tuxes 
look down upon the suits
The
Suits look down upon the sport coats
The
Sport Coats look down upon the dress shirts
The
Dress Shirts look down upon the polo shirts
The
Polo Shirts look down upon the tee shirts
The
Tee Shirts look down upon the tank tops

The
Tank Tops look down upon the shorts
The
Shorts look down upon the swimming suits
and so it goes
