Plain White Athletic Crew Socks QTY: 3
They don't really have to be crew. I brought ankle socks
Black leather service shoes (NO patent leather or Corofram) QTY 2
No corofram. I brought mine thinking the same thing. They just sat in my closet for the entire year, and you wear blues four days a week. I made it by with just one pair though.
Khaki pants (full length, no cargo pants, light color) QTY 1
That beige khaki. There will be a lot of variety among C/Cs, so don't worry about a specific shade. These are usually worn in place of ABU/Blues when civilian clothes have yet to be authorized but you want to go off base or something. Sometimes worn at official Prep School functions (a few times at the AFA football games) or when representing the P while doing volunteer work.
Brown leather shoes (plain, slip on or laced)
I don't recall having time to buy shoes before we were required to wear the husky gear (AFPrep shirt, khaki pants, shoes). That's a gamble you'll have to make yourself.