Nonsense!
Fashion rules are made to be broken.
Wear white after Labor Day, have a pocket square that matches your tie, wear black shoes with a brown belt, and you can never be hip enough when it comes to wacky sock colors/designs.
Mistletoe print tie right above your "it's business time" area....always a subtle Christmas classic that delights those in the know.
Honestly, in this particular trade, nobody cares.
The whole mix-n-match new pilot uniform was inevitable when we went a couple of years without a standardized FA uniform (itchy vendor) and you couldn't tell who was working in the back.