For some strange reason I am always attracted to white shirts and black slacks! When paired together though the full outfit can look a little host/waitress-ish.
By finding peices that have details in the tailoring and adding heels and a bold clutch you can look very cool and sexy! Find a light weight button up shirt with rolled up sleeves. These slacks from Old Navy are great paired with heels (the hem is at the ankle and needs heels to lengthen your leg) .