The simple and sure way to pull off a vest as a shirt is wearing it with matching dress pants. This menswear article typically comes in neutral colors like navy blue, black, gray, and brown. But to make your ensemble fashion-forward, go for an exciting color combo. A bright green vest and pants are killer. You can pull it all together with matching accessories in shades of a complementary color, like red. Channel your inner Elle Woods with pink heels, pink hair clips, a pink purse, and even pink nail polish.