I suppose I don’t think of this as so much about doing things or looking a certain way to accepted, but rather choosing your daily props to help you know how to act or function in a challenging world. This something I do. If I don’t know what to do I pretend to be someone else... someone who does.
That's what I thought of when I read your initial post.
I think in my INFP 9ness, it simply hasn't occurred to me very often to do this since, for the most part, what I value/like/feel/think just is, and it's much easier to go with the flow of that than not (and, depending on exactly what we're talking about, at times I would have said it was wrong to pretend otherwise). There's one huge example that comes to mind when I reflect on it, though, which is once when I was feeling very insecure about my physical appearance and attractiveness, and it was suggested to me to imagine someone who is attractive the way I want to be, and imagine myself as them. I didn't actually have any props for that, though.
I suppose I might say that part of the way I've used makeup in my life has been for this. I do find makeup fun,
but I have typically have such a soft hand putting it on, that some people can't tell I'm wearing any as compared to my normal appearance. At that point, I guess it ceases to be for me to actually physically look better, but more for me to
feel I look better? Clothing that is out of that norm tends to feel this way, too, like if I have to dress up for an event. The clothes don't typically feel natural the way my normal clothing does. Or clothing for a very specific purpose, like a belly dancing scarf with coins that make noise (which honestly I've only really worn at home while practicing,)
and part of the point of the noise is it makes it more fun and can clue you in to whether you're performing moves properly, but it also clearly is a persona prop.