CREDIT: 
Prometheus Global Media

Leesa Evans is a film costume designer (Bridesmaids, This is 40, Neighbors, Trainwreck) and celebrity stylist. She's hugely successful... 

Here's Leesa's easy-to-follow guide to choosing the right clothes for you:

1. Remember a time you felt great about what you wore.
2. Analyze why: fit, feel, comfort, silhouette...
3. Use those attributes as a guide for choosing other items of clothing. If you like the way a sun dress fits, don't force yourself to wear a slinky cocktail dress (unless you feel great in that too.) Choose a more sophisticated dress that fits and feels the way that sun dress fits and feels.
4. Use color to add or subtract sophistication. If you like jeans, buy a few pairs in different colors. That will give you options within the "casual" range.
5. Stick to what works. Unless you really love taking risks (and most of us don't), find what works and stick to it.
6. Always think about how you feel, not what others might think. What matters is whether you feel confident and powerful and happy. A compliment is momentary; how you feel lasts all day.