Sophitia -- Soulcalibur VI
A sword-wielding staple of the bounce, bounce jiggle, jiggle fest that is the Soulcalibur series, seraphic Sophitia has always more or less managed to walk a fine line between gracefulness and gratuitous boobage -- at least in comparison to, say, Ivy.
Gravity works in every lady's favor in this fighting game franchise, and Soul Calibur 6 aims to bring more story to the franchise, as well as additional mechanics that will help players through its more-than-button-mash learning curve, which should help bring it back to the forefront of the cosplaying community. 
Although this iteration has her shirt slit down almost to her naval (no one is fooled by those laces), Sophitia still remains one of the easiest of the reoccurring SC characters to cosplay -- one that keeps all the goods in place, while still allowing for a little leeway when it comes to having the perfect body.
She's also cooler than Cassandra, but that might just be my bias showing.
(Hero image source: polygon)
(Secondary image source: DeviantArt)
