should i keep it?

I moved recently and found that I have far too many outfits.
So in an attempt to lead a simpler life, I have thrown out tons and tons of clothing but still find that there are some items I cannot part with.

Here is one piece for example:




It belonged to my mother and I can honestly say I've never seen anything like this before. They really don't make them like this any more--ladies, but then again I don't know if I'd dream up anything like this, and I don't know why I would.

Unfortunately since it really is vintage, there is a hole in the middle. I could easily sew this but let's get real. I'm very lazy.



But it does have this nice collar. Very nice.
It could be a costume or something like that?