The reason we know it isn't a slip is that she adjusts and then later she went through the file and removed anything that showed and only then when she knew she hadn't shown anything did she release the video. I mean, this is bloody obvious. There is no such thing as a "slip" in these videos, everything is deliberate and if there is a hint of a nip that she doesn't want seen, she removes it. She is happy to do some sheer, some outline stuff but she is not showing anything!