No, it doesn't suit her. It doesn't suit anyone. It is the most boring, rudimentary, unappealing dress that can possibly exist. It doesn't even have a texture-map. It probably has a 1-figure node-count. It has all the detail of a toilet-paper tube.
@Shikuretto_Tsuki : Reactions to my comments vary. But yeah, I speak my mind regardless. Funny thing is I can't really NOT do it. To see something I strongly disagree with and not comment anywhere about it just makes my skin crawl until I can't take it any more.
@SotiCoto Hey, its a manga, what do you expect? Now, if this was an anime that had full-screen drawings of every frame (don't know why I referred to hand-drawn animation so weirdly), then the dress would need to be more detailed, but as it stands, its fine, it suits her quite well, I believe, a simple dress for an outwardly simple and quiet girl.
Also, unrelated, but this manga needs to get the Tagaki-san treatment, or maybe the Delusions chapters are the mangaka's way of doing that.