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I work in a private company that requires business-professional dress (For men, tie is minimum.). I am new to the company (in IT), so the first couple of days of work I wore a jacket and nice slacks. As the days went on, I was told by several individuals within my team (they have all been in the company a minimum of 10 years, some 35), throughout the department, AND by my manager that it is an "unwritten rule" that IT is allowed to get away with not wearing suits, unless they are meeting with vendors.
This struck me as a little odd. However, I knew they were not lying because some days men would wear suits and most other days simply no jacket, but still tie/slacks/button-down. I have also seen other people walking around without jackets as well - some I have never seen wear a suit/jacket.
I have seen posts on here regarding Dress to impress, and Dress for the job you want. While I agree, there are days I am running late or don't have a jacket that matches the shirt/tie combo, and thus don't wear a jacket.(Please refrain from answering "Just buy another one.")
Am I losing 'professionalism' points or possibly giving myself a bad connotation because I am not wearing a suit everyday?
Note: My manager only wears his jacket into/out of work and in meetings with someone higher than him (his boss, CIO, etc.), as does my previous manager .