I always found the dinning rooms to be very comfortable with long sleeve shirts. During the formal night and at Palo I wore a suit and was just right, not too warm or too cold.
I was never cold and I wore sleeveless and short sleeves every night. The only time that I was slightly cold (but only for a few minutes) was in Palo. But the main restaurants I found to be very warm, so no sweater was necessary.
Have fun!
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