A power suit is a skirted suit, not a pantsuit. For a strong, yet open, look, try softer colors like camel or beige. Remember that shoes are part of the environment. Keep them cleaned and polished. Research your office environment.
Every office is different.
Remember the hierarchy of conservative dress. In that order. Project your professional image, not your sex appeal. Dress like a man. Actually, this isn't so much a taboo as an outdated style of dress.