I sailed on the Enchantment in February, first time on Royal Caribbean for me.
It was a 5-day trip, one formal night. I wore a black mid-calf length dress .. spaghetti straps, some beading on the top.
People at the next table were in shorts & T-shirts ... parents & kids.
I saw people dressed in formal gowns, a few men in tuxes, teens in low-rise jeans or skirts and tiny tops ... it was really a mixed crowd.