Yesterday Theory announced that former and much-celebrated Nina Ricci designer Olivier Theyskens had been appointed artistic director of the entire label. Theory had previously hired Theyskens to design a capsule collection for the brand, called Theyskens Theory, debuting for spring 2011. The Theyskens Theory line, which the designer has called “quite personal,” will continue under the designer’s new expanded role as a collection that’s a little bit fancier and more expensive. Theory has released the full look book of the first Theyskens Theory line, which you can view in the slideshow. Theyskens’s first full Theory collection (not the Theyskens Theory line, but the rest of it — don’t let the complex nomenclature trip you up) debuts for fall 2011. But the truly important thing, you guys, is … he’s BACK!