How should a 55 year old dress?

5 Rules of Dressing in Your 50s

Embrace color. While shades of grey can come across as matronly, bright and bold color will rev up your look and perk up your skin tone. ...
Free your neckline. Swap the deep plunge in favor of a universally flattering boatneck. ...
Upgrade your knits. ...
Play up your waistline. ...
Find your fit.

What not to wear to look cheap?

A fashion expert has revealed the fashion faux-pas that can make any outfit look cheap and how you can elevate your wardrobe. Natalia Denise said to avoid clothing with 'frumpy' elastic waistbands, exposed zippers can 'cheapen' an outfit and that skinny jeans, especially those with distressing, are a 'big no-no'.