With regard to the general comments ref. ties, if your employer has the white shirt/black trouser code, do what a lot of the airline guys do ........wear a clip-on.
Looks smart and presentable around ops. and the offices and take the thing off in the aircraft.
Oh, and yes, defo no epaulettes and, please, clean shoes !, at least at the beginning of the day ! After all, the idea is to be recognised as an Instructor, isn't it ?