Tip #1: Watch And Learn, Study Up ... Then EmulateTo do it right, learn!
Read women's fashion magazines and study the styles.
Watch TV shows (as well as women on the street) and see what women wear. I liked a show years ago on cable, 'What Not To Wear' with Stacy London. It was great and I learned a lot.
Women's clothing seems to go on sale quickly so why not go with last years style. The style must fit you, not the model.
Study and emulate women. They have had a lifetime to perfect themselves and can show us a lot which we can learn a lot in a short time ... if we apply ourselves.
Dress for your age! I know I'm not a teenager any more and wouldn't want to be. I find maturity a great benefit.
Practice! Practice! Practice! Especially walking in high heels as it is not natural for most.
Accessorize! That aids in your overall appearance.
Be the woman you are ... nothing wrong with being in jeans or a dress or a skirt and blouse. Be what's right for you, alternate between them and find your niche.
Try clothes on whenever possible and it is possible today in the stores. Sizes are tricky so try them on, once you know you can take something right off the rack every time.
Lose weight, it is healthy (within reason).