My philosophy is that Monday and Friday are the days of the week when you should get most dressed up. Why? First and last impressions count. Monday, while co-workers are lethargic, disheveled, and stumbling into work, you should be crisp and clean and ready for business. Friday, when everyone is already mentally and stylishly checked-out, you come in just as prepared to conquer the world as you were on Monday. The higher-ups will take note, and so will your clients.
(**The one caveat here is you should avoid doing more than “one-upping” your co-workers. This is a judgment call and will depend on your work environment. So, for example, if the culture in your office is that everyone at your level wears t-shirts and jeans on Friday, you could go with a button down and slacks but should avoid a 3-piece suit. The idea is that anything more than “one-up” looks too snobby.)
This Formal Friday’s lesbian style inspiration is this vintage Dolce &Gabbana ad for Harvey Nichols:
Dolce and Gabbana for Harvey Nichols, London