Goblin you are a dill.
No where in the criteria for ANY flight test is there a section on personal presentation.
As an ex ATO and FOI, I would suggest you would not have your approvals/delegations very long if you tried to impose your ideas of dress standards.
Personally I would not, present with bars and stars. But that is my choice and should not influence others.
Girl With A Stick. Do what makes you feel comfortable and don't listen to the (B)ankers.
God speed GWAS
Maui