If you’re fortunate enough to work in a casual office, the trick is to avoid getting too casual or creative with your dress. According to the survey by Salary.com, your coworkers make specific judgements regarding your capability based on your clothes, which may extend to employers as well.
For Men:
Casual pants and slacks, but never jeans unless stipulated as acceptable by HR. If jeans are permitted, dark-wash, straight-cut only.
Casual accessories, such as brightly colored watches.
Shoes that are clean. Sneakers are usually acceptable, as are loafers.
Hair and nails can be more casual. Nails should remain short and clean, and casual offices generally allow for longer hairstyles and ponytails.