Oh, Rute, this is a hard one then, if you had such an emotional response to it! But I hate to let it go because it seems like it would be a high-happiness-factor item if you were able to find a couple of suitable venues for it. Could you find a low wedge heel to wear with it, or a very low heel that is comfy? What about a nude pointy-toe flat? (I don't have any experience with pointy-toe flats, so I don't know for sure what that would look like.)
I guess I would say that if this dress is still on your mind a few days later, I would buy it. I wouldn't take the tags off, but I would hang it in my closet and see if I can find a place to wear it. If by the time the return window is nearing its end the love has faded, you can return it without a problem. But if the return window is nearing its end and you still are in love with it, I would keep it. I think part of the problem with finding venues for it is that maybe it is a little outside your comfort zone, since you described it as loud?
Personally, I would just wear the skirt out to do errands or to meet a friend at a coffee shop or something. The outing doesn't have to be super-special. Since I work at home, I regularly dress up to go out to run errands. It's fun!