Confusing!
http://fashion.about.com/cs/glossary/g/bldefaline.htm
About.com says it's " A dress or skirt silhouette that is narrower at the top, flaring gently wider toward the bottom thereby resembling the letter A" .. but that's like any dress. I think it's good im not in fashion, haha
Also says "Works well on most figure types; good for disguising bottom-heavy figures." I don't think ayu is bottom heavy