During knightage, church feasts, deaths etc. the members of the Order of St. Constantine the Great and of St. Helen (hereafter only members of the order), wear ordinal cloak of respective rank; under the cloak laity members wear black suit with bow-tie. The decoration cross is under the bow tie. Clergymen are, under the cloak, dressed according to Typicon.
During other feast occasions the members of order wear dinner jacket (replaces black suit), white shirt, and bow-tie together with the decoration of the order.
During common worldly use the members of order wear replacement of ordinal decoration, in the form of rosette. Rosette is placed on the left flap of any full dress.
Newly accepted members of the order attend the ceremony of knightage in a black full dress and with a white shirt and bow tie.