Possibly Very important- her stripper outfit. If they have earlier pics of her in this outfit, they can compare it to later pics to see if she is wearing it any differently. Also- Notice the garter straps seem to be attached in the first pic. Would she actually re-attach her garter straps after being brutally raped?
Before I answer that can you refresh my memory by informing me of just what items the police retrieved of the complaining witness from the lacrosse players bathroom.