While orange and other citrus hues may have been spring and summer’s It  colors, for fall and winter things are taking a much more somber note. A  deep cobalt blue is going to be the shade for fall ’11, reminiscent of  Yves Klein blue and post-World War II art. A close cousin to  neutral  navy, this is one of the most forgiving It colors we’ve seen in a while. We’re imagining pairing Yves Klein blue with other shades of blue for a  beautiful monochrome look, or with black and cream for a classic taste,  or as a backdrop to pops of red or neon. So wear a little or wear a  lot—you’re sure to look fabulous.  	
 Thakoon, Imaxtree   	
 Karen Walker, Imaxtree   	
 Derek Lam, Imaxtree   	
 Jason Wu, Imaxtree   	
 Anna Sui, Imaxtree   	
 Balenciaga, Imaxtree   	
 Matthew Williamson, Imaxtree   	
 Peter Som, Imaxtree   	
 Diane von Furstenberg, Imaxtree   	
 Zac Posen, Imaxtree
 Oscar de la Renta, Imaxtree