I'd say it fits plus sized girls. Reading reviews (if they have them) is helpful or if there is no review on the piece you like read reviews on pieces from the same manufacturer. Coquette does a lot of higher quality plus sized lingerie that fits really well.
My partner is plus sized and definitely has had mixed experiences with various brands of lingerie. I would say read some reviews and go from there. Some manufacturers just have different sizing/styling choices that can affect how things fit.
Definitely read the reviews first (if there are any) on that certain piece of lingerie before you buy it. It helps a LOT! I'm a plus size girl and I've found some pieces that work for me. You just have to be picky and read those reviews.