I know this is a very common question!
And this will probably be an unexpected answer.
It doesn’t matter.
I’m serious. I’ve been putting a LOT of thought into it and for me, it doesn’t matter as long as what you are wearing is YOU. If it is what reflects YOU and who YOU are, then go for it. Think about something that reflects you and what makes you FEEL good!
That’s my job, to document you, for who you are, as you are. And yes, being put together and looking great can be important, I think the most important thing is to bring yourself.