Apparently this has been happening at select venues over the past tour, leading me to believe it is simply something particular venues decide on, probably knowing Axl's history of stopping shows. Last time these stories came up, Axl tweeted that he had no knowledge of banning clothing from shows, nor did he have any intention to. As other have said, I saw GN'R in Atlanta, and there were people dressed in Slash garb and I wore my Appetite for Destruction t-shirt.