Just before the last thread closed, a poster mentioned that Walmart sells a black, Tyvek-type outfit, made by Dickies, which may explain the Walmart receipt and 1 Dickies tag, referenced in the above listed items removed from BK's apartment. I feel the need to follow-up on that comment.
Dickies does make a 1-piece coverall suit in black, and I believe that is sold at Walmart, but it is not like a Tyvek suit in any way. It is not tight-fitting and disposable, and does not cover the head at all. It is basically what one thinks of when you picture an auto mechanic, basically a one-piece, zip up jumpsuit. BK may well have worn something like this, to make himself less visible in the darkness, but it would have done nothing to prevent him from leaving forensic evidence all over the house. I almost hope that he was wearing something like that, as he may have been less likely to throw it away than if it had been a Tyvek suit. JMO