It obviously depends on what kind of look you are trying to achieve. I know a girl who is like US size 00 but has men's sweatshirts in size large and wears them for a particular aesthetic / styling / fit. That being said, sounds like you aren't really liking what this looks on you, so perhaps you should return it for a size down.
Also my personal feeling is that (like some others mentioned) the shoulder/arm portion of this particular cut may not lend itself well to a super oversized look (too puffy). I'd go for a smaller size myself...hope you can find exactly what you are looking for!
Also my personal feeling is that (like some others mentioned) the shoulder/arm portion of this particular cut may not lend itself well to a super oversized look (too puffy). I'd go for a smaller size myself...hope you can find exactly what you are looking for!