One Size dress?

I've been going through Hello lace's wardrobes and there are a lot of dresses that are eye catching to me. When I look at the measurements of the dress I'm only a couple centimeters off from the description (on some)
I've heard that some lolita dresses only carry one size. Is that true?

For instance, this AatP dress
http://hellolace.net/wardrobe/alice-and-the-pirates/type/set/item/1/

Is this the only size or is it the size of the dress in the picture?