Okay, I just got off the phone with my mom--I forgot she'd be calling my sister. My mom confirmed that Very Ancient Koreans tied their clothes on the other side, but she had never heard of any superstition about tying things on the other side. (I explained the kimono thing to her and she was all, Huh. So, I don't think the same thing about the dead exists at all, and if it did she would definitely know about it.) Hope this is helpful!