Wear a button-up collared shirt with your pencil skirt. Tuck it in and include a belt. You can also wear it out with a wide belt around your waist.
Add a pullover or button up vest to the collared shirt. Vests are in style and provide an alternate look to the blazer. It's simple yet professional.
Pair the pencil skirt with a cami or tank top. Add a blazer on top. If your skirt is black, you should only pair it with a black jacket if you have a true color match. If not, add a pop of color to the jacket.
Top the pencil skirt with a V-neck sweater. If it's too low cut, make sure you wear a tank top, cami or collared shirt underneath.
Mix and match your pencil skirt. A black skirt can be worn a few times a week as long as you change up the look. No one will ever know.
Keep the shoes professional. Wear sling-back heels for a truly professional look. Avoid sandals at all costs; they're not professional.