This does not make me an expert in the area of job searching, it is only an attempt to shed light and give you an edge over your competition in areas you may not have put much thought into. First impression is everything. The appearance of reliability and dedication are very important to any employer. Clothes pressed and well fit give the impression of being neat and organized. Wrinkled and baggy says slob, unorganized, and probably not very efficient.
Good grooming shows high self-esteem and confidence in one's ability.
A person who is well groomed and fit gives an impression of an initiative taker, one who is self-motivated and disciplined. The manner in which one presents himself or herself can greatly affect a first impression. Many factors go into how an employer will evaluate the characteristics of an individual. It is good to present oneself as confident, but an overly confident approach can seem cocky or arrogant. It is truly a balancing act as to how an employer will perceive certain aspects of character or personality.