A tuxedo.
For the sheer entertainment of the recruiter...
I would go "business casual." For my first meeting with my recruiter, both in Philadelphia and Virginia Beach, I wore khaki pants and a dress shirt (tucked in) and nice shoes. After the initial meeting I think you can tone it down a little, but I always wore pants/jeans and a collared shirt whenever I went to see him (except for when i took my PRT).
Appropriate civilian attire is a good place to start. Jeans or Khakis, Belt, Collared Shirt (tucked in), NO FLIP FLOPS. Business Casual is good to...
A tuxedo.
For the sheer entertainment of the recruiter...