I'm a baffled by these blanket statements about how all customs stations in [continent] and/or [country] operate, and exactly how to pass muster with them. Even a passing familiarity with our own TSA should make it clear that standards for acceptable dress and conduct can be upended with a shift change. Most of our loadmasters and FMEs know to travel with white uniform shirts and epaulettes in their go-kit on the off chance some puffed-up local bureaucrat has decided that is the only acceptable way to enter the country this week. Ignore their wisdom at your peril.