Back in November, I mentioned that I had been to an op shop where my sister-in-law's mother (I'll again call her E for convenience) volunteers. In December, I visited my brother and my sister-in-law, and no mention was made of E having recognised me.
While I was fairly sure that if E had recognised me, she would have said something to her daughter, I also thought that there might have been a small chance that she might have simply said nothing, so a lack of comment might have been inconclusive.
I visited my brother and his wife last night, and mentioned in conversation that I had seen E in the op shop and didn't think that she had recognised me. My brother jokingly said "you weren't in drag were you?", but I didn't get a chance to respond immediately, as my sister-in-law was telling me that it wasn't a bad thing that E hadn't recognised me, this being with the assumption that I'd been there as a male.
When I finally got a chance to mention that "I was wearing the wig that is closest to my natural hair colour", the conversation became somewhat comical, with everybody making jokes about it. I was not only reminded that St Vincent de Paul is a Catholic Church run organisation, but that E has some rather traditional views, and that if she had recognised me, my brother and his family "would have never heard the end of it." There was also a suggestion that my brother "would have been ex-communicated from the family" ... "with an axe" ... "or a chainsaw if she could work out how to start it."
While some of the comments were obviously a little exaggerated, I think that it's safe to say that if E had recognised me, my sister-in-law would definitely have known about it. Some of the people who know her best are quite confident that she would not have said nothing, so it's fairly safe to assume that she didn't recognise me. :)