Seeing my first highly rated GFE high end provider girl tomorrow night in the northern VA area.  Deciding what to wear.  lol  Also suspect most responses to my question will be:  who cares, wear what is comfortable!
But putting it out to all of you just to see if you have opinions about it.

Long or short sleeve based on your preference considering the weather. Khakis (not shorts) because it's still casual but more formal and more appropriate (my opinion). Dressing this way meets the goal of being comfortable but showing you took some consideration of how you present yourself. Nice dark socks and nice looking comfortable casual shoes not running/tennis shoes.
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preferred apparel. In the summer if the weather is hot & muggie, then I will wear a nice pair of shorts and sandals.  

Be clean, be groomed, wear clean clothes. not too casual like you don't take her seriously(no workout clothes). Be comfortable. You're going to take the clothes off anyway, right?

Regardless of whether she is highly rated and you show up dressed in Armani to make an impression, it won't mean anything if you come off as being an ass.  So if you want to make an impression, just remember she is still a lady and a woman.  Her career choice as being a provider shouldn't diminish that fact.

an aloha (Hawaiian) shirt with Bermuda shorts and huaraches.

Just kidding. Who cares? Wear what's comfortable. Just don't look like a homeless person. They'll have sex with you anyway.

Can you even buy spats anymore?

Absolutely.

bring a great smile, trim nails and be a gentleman.... thats all we care

I once booked a 4 star hotel and someone came to see me in his ratty sweats which I can imagine made him stick out like a sore thumb.  That being said as long as you don't look like a bum I think you should be fine.

Some guys can go to a 5 star restaurant in beach attire and pull it off, other guys can be dressed in a tux and be mistaken for the waiter.

In my line of work, no one hands you a billion dollars to watch if you're not wearing a suit.  

I will concede that on Wall Street, a suit and tie is the "uniform" but the Warren Buffets of the world don't have to even wear shoes if they don't want to after they reach a certain stage in their life.

One out of ten thousand monkeys banging on a typewriter would have produced Othello.  The same is true of the Oracle of Omaha.   Some get lucky.  Some work hard.   Some walk the plains of Midland, some of us earn the respect of clients over decades of good advice.  Same result, different uniform.  

I still strongly disagree with you, but if you would like to continue on this topic we can take it to GF or P&R, but what we cannot do is carry on this discussion here.