Recruitment in Wisconsin is laaaaaaid back. Don't wear sweats because that's sloppy, but jeans and a cute top are more than fine. My recollection of Oshkosh is that the houses are fairly close together, but it's been a few years since I was last there. Do you know who your Rho Chi is yet? You could call her if you are worried about clothes. What you have listed sounds fine and maybe even a little extra-dressy, but that's not necessarily bad.
