Wearing a turtle neck sweater under a business suit in a contrasting color, is almost like a means of accessorizing. Regard it the same way, as when you put on a scarf in a different color to accessorize your suit. Sometimes we ad interest to our business attire by adding a scarf around the neck, but another way to acheive a silimar effect, is to purposly choose a turtle neck in a color that sort of “accessorizes” the suit outfit. This red suit jacket is contrasted with  a black turtle neck, which also ties in with the black buttons of the jacket. The black/white speckled suit jacket is accessorized with a white turtle neck, that blends with the white spots in the jacket. And last, this gray business suit has a pink turtle neck that adds a little extra life to the gray. (This pink sweater is not a true turtle neck, but it has the same effect). The last two examples have a lifting effect on the business suit, whereas the first example gives a striking, dramatic effect to the whole image. Having at least one turtle neck in a color is a good foundation for a professional wardrobe.