I bring my "fantasy" apparel....
This is for the ladies, and I'm sure it's been answered before. I am cleared by you for a session. Would it be out of the ordinary for me to ask sizes...shoe and say lingerie...so that you could wear something of my exact choosing; I would be purchasing and bringing them to the session.
I think as with anything in this hobby, it is YMMV. Some ladies might not give it a second though and share with you. Others are probably more guarded in giving out that info. If you are lucky, some girls actually put that info up on their websites where they talk about "gifts".
Just show up at their door dressing as Wonder Woman with your golden latriat that would save you time buying girlie things.