It all depends on the work environment. If a software engineer is in a professional work environment or office, they tend to dress business casual; if they work from home or a remote location they can dress as they please.
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Fake amateurs/wannabes wear (cheap)collogne, (cheap) tucked dress shirts, (cheap) dress pants or khakis/w belt, black leather shoes, wear cellphone on their belt, wear their hair neat and tidy ...
Real hackers/programmers wear jeans, snickers and tshirts, and have messy hair
Environmental Engineers do not wear uniforms. However, the company that an environmental engineer works for may have a dress code.
They can wear anything they like. It is not a profession that needs any particular kind of dress code. Some programmers dress very casually and some dress very formally. It may depend on the actual company they work for.
Dress codes are usually set by the employer, not by standards of the profession, and imposed upon the place of work and everyone in it. The only exception I can think of right now is in the case of the clergy.
Basically, professionalism in computers refers to your ability to interact with other people. Everything from the way a technician talks to users to the personal hygiene and ability to dress professionally.
computer science , being a scientist , and doing world wide web. although he likes to keep him self busy all the time.