I have no idea about clothing style.
But:
Do you love your hair right now? If not, I guess you'd start by finding a stylist who'll get you to cut and color that makes you smile when you stumble into the bathroom in the morning and catch sight of yourself in the mirror.
How about your undergarments? If you're in uniform all day all week, terrific bras and panties are your main option for feeling fantastic about how you look. (Forget what other people see; *you're* your most important audience, and you see your underwear at least twice a day.) Consider trying a set, if you haven't experienced that esthetic before. By all means allot a sizable chunk of your clothing budget for the highest-quality undergarments you can find, and get expert advice on fitting if you haven't been schooled previously. Prima Donna, Prima Donna Twist, Marie Jo, Marie Jo l'Aventure and another brand or so are made by a Belgian manufacturer with excellent quality standards -- far surpassing that of Wacoal or other easier-to-find lines. No, I don't work for Van de Velde (the manufacturer) or any affiliate; I'm just a stickler for quality, fit and longevity, and it's the best I've found so far. Your mileage may vary, of course.
Of course, having these two things in order might mean you run the risk of feeling delectable as-is, in uniforms and loungewear, thus diminishing your motivation for figuring out color, body shape and so on. **cough, cough***
But eh, hair and undergarments, hard to go wrong by getting those right.
There were a couple other essentials Angie mentioned. Clearly, I'm not that advanced yet. Footwear is my third building-block, just beginning work on that one. All I've really accomplished since finding YLF is (vast) improvement of my loungewear capsules, but that's been very much worth the effort.
