If you read orders it states that flying clothing should only be worn when you are expected to "Fly" if you are on ground duties that day or are defo not flying then you should be in blues!
Funny how few Aircrew you see in blues when they definately haven't been or are going to be flying that day.
And as for the beret vs chip/(****) hat lets not even go there, it's uniform it's not meant to be trendy and if you hadn't noticed the chwat hat looks like shyte!!!!