Evening dress B

—( navy ) a uniform to be worn at social evening occasions where officers are invited in their official capacity, and at dinner on board ve els other than those of the fourth rate by officers for whom the evening dre coat has been prescribed (except when the uniform of the day has been white). Consists of—for all commi ioned officers (except chief boatswains, chief gunners, chief carpenters and chief sailmakers) and for midshipmen: evening dre coat, evening dre waistcoat, blue (unle white is ordered), undre trousers (unle full dre trousers are ordered), blue cap, black tie. In hot weather or under other appropriate circumstances me dre may be substituted.