For functions where the hostess considers it necessary to indicate the dress expected to be worn, 'White Tie' may be added for evening dress, 'Black Tie' for dinner jackets, or 'Afternoon Dress', 'Informal' or 'Lounge Suits' for suits.
Otherwise she is content to leave the dress code to the discretion of her guests. Whenever possible, many hostesses will try to indicate more specifically the level of dress expected, either verbally or in a letter if one is being sent with the invitation.
'Decorations' on a private invitation implies that a member of the Royal Family is expected to be present. Note that the word does not have this meaning on an official invitation.
If there is no information to the contrary, it is understood that the function is to be held at the address to which a reply is requested.
If the function takes place in the country, it is useful for a map to be placed on the back of the card or on a separate sheet.
If it is necessary to keep out gatecrashers, 'Please bring this invitation with you' may be added at the foot of the card.