The Last Days of Yesteryear: Chapter 16
For a fiancé to invite another woman to dinner is, by definition, scandalous.
High-society is full of these mine-fields: events or behaviors that are inherently scandalous, yet also occasionally necessary. It is for just these situations that the Listed Proprieties of High Society, vol 3 was written.
When inviting a guest of suitable age and prospects to a meal, (says Chapter 7: the intricacies of pre-wedding society) a series of letters, invitations, and announcements must be used to ensure preparation and propriety from all involved. These include: a letter of formal invitation to dine; a notation of marital status; a letter of affirmation, sent to the fiancé’s partner; a request of permission to the guest’s relatives, if any such letter is required (see footnote on page 324); a signed agreement from the guest; an announcement sent to any and all servants of the guest; an announcement sent to any and all servants of the host; and a written and signed declaration affirming any and all behaviors that will be deemed impermissible by all present, to be notarized no later than the week after said engagement. This is in addition to any and all letters, invitations, and announcements that must be used for a regular meal, such as a notification of the menu, and outline of acceptable dress.