Casual Fridays have long been celebrated in the working world as a break from that stuffy office wear. But, a little reminder: “casual” should be used lightly if you still want to be taken seriously. For women, that means no sweats, no jeggings, and definitely no crop tops. To be safe (you know, in case you run into the CEO), stick to these seven rules to live by from Marie Claire. Then, come 5PM, feel free to rock all of the aforementioned no-nos.