The office party is one of the trickiest dressing occasions going because the parameters are genuinely contradictory. You want to look like you made an effort but you also need to see these people in a meeting next week. Festive but professional. Fun but not so fun that it becomes a story. The smartest approach is to find something that reads as properly dressed without tipping into anything that requires an explanation. A great midi dress in a bold colour, something with an interesting texture, a classic silhouette in a slightly elevated fabric. The goal is to look like yourself, just a significantly better dressed version of yourself.