Casual office dress codes are now pretty much the norm in some industries, particularly if you work in tech or media and are not in a client facing role. Some other offices do keep a business casual dress code, but have dress down days on Fridays as a weekly thing for staff to look forward to.
However, for some people, the casual environment can actually be harder to dress for than a smarter one! If you are someone who feels more ‘ready to work’ when they are wearing professional looking clothes than when they are in comfy jeans, or someone who just prefers a more glamorous style whatever they are doing, then putting on the casual work staples of jeans and a sweater or t-shirt can feel quite uninspiring. After all, work is where you spend a good amount of your time and have many of your social interactions, so you want it to be somewhere you can show off your own personal style if that is something important to you!