Hen party outfits for guests follow a simple brief: match the energy of the event without outshining the bride-to-be, and dress for the venue rather than the occasion in the abstract. For a daytime event, a midi dress, a tailored jumpsuit, or dressy tops and wide-leg trousers. For an evening event, lean into colour, embellishment, or texture - a satin dress or a party jumpsuit read as dressed-up without defaulting to full occasionwear. If the group has a colour theme - white, pink, or a bride-chosen palette - build your outfit around that as the constraint and let fabric and silhouette do the differentiating.