Mens colognes are not an absolute necessity for your suit, but neither is salt for your soup. Colgnes add a much needed spice to a man and should not be overlooked.
A word of caution, do not wear a fragrance with your business suit or interview suit. An added bit of pleasant aroma is great in most cases but not at the office.
Old Spice and other such concoctions are viewed as unprofessional and should only be worn with your formal and casual party suits.
Quick Tips
1. Buy a scent that is pleasing to your sense of smell but not overpowering.