Don't worry about it.
They are the ones needing to cover their ass legally. If things need signing they will do so.
Wear business casual. Slacks, not jeans. No sheer tops. No sleeveless. No cleavage. Closed toe shoes. Don't put the make up on with a trowel. Clean hair. Don't be soaked in perfumes.
Ah ****, just saw you're a dude.
Again, slacks. Closed toe shoes. Don't be a douche with a lot of hair gel or aftershave. Have something professional to take notes in like even just a legal notepad or a small one that fits in a pocket but never jot down patient names. Wear dress socks and business casual shoes. If you're poor like me, I just had black athletic socks calf length. Just when you sit down no one wants to see your white ankle sox or the skin of your calf. Shirt should be collared, a button up. No graphics on your t's. Coat shouldn't be a hoodie or something of that nature. You don't have to wear a tie but if it makes you feel better. Only speak when spoken to and do whatever you're told like the most important game of Simon Says ever.
If you're a coffee drinker worry about your breath.