I always think providers dress like any "regular people" is most sexy -- no lingerie, no sexy dress-up.

Imagine: you were in the mall alone.  Suddenly, a nice-looking young female shopper there walk up to you, and said:

"how would you like if I give you a BBBJ with CIM?"

"That will be $300.  I saw a dress I really like at Nordstrom today, I have to get it."

Having them slip out of a robe,with nothing on underneath...can be very erotic also!...Just depends on what turns you on!

For just a BJ...

That is a good question because you want to look presentable but you don't want to look like your are in uniform. With that said should you dress professionally with a hint of being suggestive.