I think this is my first post on this forum since the last one appears to have got lost somehow :)
I work in an environment where good dressing is encouraged and recognized. So it's easy for someone who likes to dress well, to blend in, without feeling too self-conscious
However what I have also seen is someone who is "overly fashionable" can attract attention in a wrong way. I say this from having worked in a corporate culture for close to 20 years, of which the last 8 have been in senior management positions where I interact with people who pay attention to their overall appearance and spend good money to accomplish it.
But there are a few that stick out for the wrong reasons and tend to get ridiculed (not to their faces, at least not in my workplace). The general perception that others have of these folks is that of being snooty, perhaps due to their fashion sense, but mostly due to their tendency to look down on others who don't share similar refined tastes.
The way I look at it is, if you are good at what you do and confident in your abilities then you could give 2 hoots to what others think about your dressing style. However if you are a newbie, still learning the ropes and hope to climb the proverbial ladder, then try to blend in with your co-workers without sacrificing too much of your fashion sense. You can still take pride in what you wear but if the rest of them are in jeans and t-shirts then perhaps a nice khaki and a button down shirt is more appropriate, than a bespoke suit.
This is just my advice to someone new to the workforce, like yourself. It's obviously just my opinion and I am sure others would beg to differ :)