Storm Irene: Calvin Klein Spring 2010 RTW.

Sona Matufkova

Practicing his signature brand of arty minimalism, Francisco Costa replaced the sharp angles and dark colors of his Fall lineup with soft, organic shapes and light-reflecting neutrals. It made for a Spring collection more sensuous than blatantly sexy—and more youthful in feeling than his recent efforts.

Jac

He opened with a white one-sleeve bubble dress that, like the needle-punched nylon coat that came down the runway a few looks later, caught air behind the model as she walked. When he wasn't experimenting with volume, Costa was creating interesting textures: smocking and puckering cotton voile for an A-line shift, or hand-pleating and pintucking an organdy dress.

Nimue Smit

Playing natural off techno, and sheer against opaque, the designer sent out mohair jacquard tank dresses that shaded from black to brown to gray and revealed subtle swaths of skin. The only departure from the show's earthy palette was a group of crinkled silk-cotton tank dresses and asymmetrical shifts in shades of pale aqua, citron, coral, and jade.

Frida Gustavsson

If there's a criticism to be made, it's that the unstructured bareness of these clothes requires the sylphlike frame of a Thandie Newton, who sat in the front row along with Eva Mendes, Rose Byrne, and Jamie Dornan. But the weightless ease of these dresses has an undeniable appeal; this was a serene beauty of a collection from Costa.