A suit of clothes traditionally worn by businessmen(noun)
WordNet. Princeton University. 2010.
Use "business suit" in a sentence
"Van Gaal's halftime chat to his players must have been brief and to the point because he spent some of the interval changing from his business suit to a track suit."
"When Dr. Muss arrived at my office, I saw a professional, rather fit-looking woman about fifty years of age in a business suit and skirt."
"So, when I strolled through the impressively appointed lobby of my Madison Avenue office, the reflection of my uniform of a business suit and the click of the heels of my comfortable Italian loafers on the marble floor provided little solace for my lack of enthusiasm toward the role I played as J. P. Farrell, Investment Consultant and Appraiser of Real Property."