In my experience, the outfit is very comfortable and its quality feels great! Its appearance is exactly like what is shown on the website, I didn't spot any differences.
I ordered a large and it fits great (I'm 162cm)! My thighs are too wide (42.5cm circumference right above my knee) so it feels tight when I put the leg openings of the pants above my knee, but it's still great as the pants is long enough to go under my knees since the pants is poofy, and walking around is still very comfortable and easy. Unfortunately, the hat came somewhat deformed such that its rim is no longer circular (it's more of an oval) and the way it is bent looks a bit like a cowboy hat, but it still looks not too bad.
Delivery was really fast for the outfit (for me, transportation time for the outfit was 7 days)! For the hat which was shipped separately, its transporation time was 25 days which is in the range stated on the website, so it's good. Also, I don't think there were additional fees for the hat that I had to pay.
Dokidoki's customer service via email is very friendly and had answered all the queries that I had!
In conclusion, I think that if you like this outfit from what is shown on the website, I recommend buying it as its quality is great and you get what you see!