Buckeye,
There has been much discussion on this topic. Use the search feature. Our personal experience was DS flew out to KP alone, wore dress slacks or khakis, shirt and tie. He had an unofficial interview with another prospect and he felt it was more official than they let on. Good call on the workout wear. As far as the sleeping bag goes, someone more recent ( DS is class of 15) might need to chime in. Our DS actually did get bedding but stories were told of those who didn't. My thought is it may very well be a good idea however with new the leadership it may no longer be an issue. Good luck. DS felt that trip was most worthwhile. He asked for the airline to let's as his 18th birthday gift and wanted to go alone. He felt that was the right move for him as it demonstrated his independence. I agreed. The first time I saw campus was Parents Weekend and it was a thrilling weekend.