Building a Casual Wardrobe . . .

Okay, I have always been a blue jeans kind of guy. I have the corporate
look down fairly well, but have never had to build a casual wardrobe. I
find myself rising in the corporate ranks and need to start building an
appropriate Summer wardrobe––especially since there is a conference in
D.C. this July that I will need to attend. I've always seen casual as a
khaki thing, but I know I'm probably wrong.
Any advice would be appreciated.
Regards,
Ben

Khaki pants with blue oxford cloth shirts counts as corporate casual.
Pressed blue jeans that don't have stains and rips work too. I've seen
men wearing plaid shirts, ties, and pressed blue jeans to work at
newspapers in the Midwest, but that may be just a newspaper thing.
Miz Spike