Logic Of The Day: 21/03/2017.
Only you can answer this question. Due to the nature of the work, some organizations are happy for people to be casually dressed, while others may expect smarter attire. It is important to be suitably dressed within expected limits.
Nobody expects you to be packaged into something you are not, but your appearance is a reflection of your own self-esteem and you should aim to present yourself to your best possible advantage. Whilst you might be casually dressed when working within your organization, a more formal approach may well be preferable when representing your organization at an external meeting.
Have A Wonderful Tuesday.