I rather think the opposite might be the case, where a crew that doesn't observe the 'custom' grows relaxed about it to the point that when they do observe it they're out of practice.
For instance, I usually don't need to wear formal attire at work, so when I do, I have to go through a whole process of 'Right, do I have everything I need? Does my tie look good? Where on Earth did I leave my shoes?'
For instance, I usually don't need to wear formal attire at work, so when I do, I have to go through a whole process of 'Right, do I have everything I need? Does my tie look good? Where on Earth did I leave my shoes?'