Envelopes : formats, doublures et adressage
Article en anglais — traduction à venir.
The two workhorse sizes are A7 (5×7") for standard invitations and A1 for RSVP cards. Euro-flap (pointed) reads formal; square flap reads modern.
Envelope liners — a patterned paper glued inside — are the cheapest luxury upgrade in stationery. For addressing, digital calligraphy printing beats hand calligraphy on cost above 100 pieces.