I saw this costume and was instantly smitten. I wanted to be a Rockford Peach when I was little and so this was the perfect Halloween costume for me. The price however, was not perfect. It's overpriced I think, but the smile on my face when I tried it on quickly rid me of too much guilt.
As for sizing. I am 5'6" and about 135lbs. I normally wear a small or a medium and this costume fits me perfectly. There's just enough room in it that I don't feel like I'm bulging out in weird places. I bought the deluxe costume with the belt and the hat. The hat is adjustable and the belt has a ton of belt hooks so it should accommodate various waist sizes. The belt loops are a little off in their specs but nothing to get bent out of shape over. The dress color is also off. It's a bubblegum pink instead of a peach color. It's a pretty pink, so it's not too hard to get over that, but the costume is definitely NOT peach colored.
So opportunity costs, if you want this costume badly enough then it may be worth the money. So far, I am pretty happy with what I bought.