Trend Alert: Turtleneck under something...
DKNY (photos via style.com)
Max Azria
Basso & Brooke, Blugirl
DKNY
Donna Karan, Karen Walker
Missoni
Max Azria, 3.1 Phillip Lim
Prada
Pringle of Scotland, Thakoon Panichgul
CLASSIC
My favourite Classic Turtleneck's look is this one by Michael Kors:

Badgley Mischka, Belstaff, Christian Lacroix

Blugirl, Carlos Miele, Betty Jackson

Christopher Kane, Chanel, Catherine Malandrino

Cynthia Steffe, Custo Barcelona, Alberta Ferretti

Erdem, Donna Karan Collection, DKNY

Isaac Mizrahi, Halston, Frank Tell

Jenni Kayne, Joanna Mastroianni, Jean-Paul Gaultier

Luca Luca, Lanvi, Lacoste
Missoni, and next two - Matthew Williamson

Ohne Titel, Osman Yousefzada, Nathan Jenden

Pamella Roland, Pollini, Ossie Clark

Prada, and next two - Ralph Lauren

Richard Chai, Todd Lynn, Tommy Hilfiger

Jean-Paul Gaultier, Michael Kors, Custo Barcelona

Richard Chai, Ralph Lauren, Project Runway Designers