Find whatever you can that fits. Maybe a loose skirt. It may not be the most hip but comfort wins over fashion I reckon. (unless you're going for a job at Vogue!) Go for dark colours, make you seem like you mean business. Then make sure you have really great hair n' make up so you look polished. Wear high (ish) shoes (if you walk talk you'll feel more confident), a few good accessories and off ya go!! Good luck