I think a uniform of some kind is important. There are 2 ways to go here...
First approach is lots of gold everywhere. The more badges / scrambled egg on your hat / gold bars on your shoulders the more important you will look / more respect you will get from your fellow aviators / more faith your passengers will have in you. For example:
The other approach is to wear totally functional clothing. You know the sort of thing: transparent pockets on your thighs, knife strapped to each ankle, gloves, bone dome. As you walk out to your PA28 / C172 everyone will think "There goes a man equipped for anything" and "I wish I was cool like that". For an example of competance, intelligence and a roll model we would like all our children to follow:
The only exception is when gliding. This is a special case where a silly hat is order of the day:
Hope this helps to clear up any sartorial doubts.
OC619