I have wondered if they asked him where are the clothes you were wearing last night ? Now we know he received those scratches on his chest through clothing that shirt would indeed be a tell tale piece of evidence unless it had already been disposed of!
I'm sure they would have asked him what clothes he was wearing and could they see them, wouldn't they? Would be so interesting and important to see his reaction to that question that morning, and also to see if he produced the clothes. I so hope they asked lease: