My SIL (ten years older than me) has always worn the same perfume. It's not a perfume you smell often but is extremely recognisable when you do, there's nothing else like it.
SIL wears it all the time, and also layers it with the same scented body cream etc. She always smells absolutely divine and it's been my favourite scent in the world since I was little. I think partly it's because of the happy memories associated with it - her and my DB (my idol) visiting when I was young.
Now I have tried lots of different perfumes trying to find 'my' signature scent but nothing remotely comes close to how much I love SIL's perfume. But it feels like 'hers', and every time I wear it I feel a bit guilty, like I'm stealing. I'd feel really embarrassed if she ever smelt me wearing it.
I'm being unreasonable aren't I? I think it's because scent is such a personal thing. I know she gives clothes with this perfume on to her kids to stop them being homesick etc...