Sequins at an office party require more thought than sequins at a Christmas party with no professional context attached to it. The sequin office party dress needs to be clearly festive without being excessive. A sequin midi rather than a micro mini. A silhouette that reads as considered rather than just shiny. The cut needs to do enough work to make it look like a genuine fashion choice rather than just the most sparkly thing available. Get that balance right and a sequin dress at an office party looks confident and occasion appropriate. Get it wrong and it is the thing people remember for the wrong reasons.