Formal attire on gala nights is one of the items to which I pay special attention and report on my live cruise threads. In two gala nights, I could count the number of tuxedo-clad and long-gown passengers on two hands. Lots of sparkly shawls. Half of the males wore sport jackets and half of those added a tie. The other half of the males went the minimum polo/long-sleeved shirt route for dinner. Except for those who wore their formal attire for the rest of the gala evening, the majority of jacket wearers removed them right after dinner. IMHO "Gala Night" has changed to just "Gala Dinner Night".
I must add that the Lido Market attire did not conform to the gala night theme and did include a number of bathrobes.
Regular ship attire was dominated by sweatshirts, flannel shirts, sweaters, t-shirts, and jeans. Of course there was a group that spent their time in bathing suits and bathrobes.
Of interest, is one Lido Market serving line at the end of the serving window hours was restricted to only crew. That was also the case for the seating area across from the forward beverage station.