What are double envelopes? Is there any reason that they are used rather than single envelopes?
A more traditional, and more formal, invitation will include double envelopes. The outer envelope will include the guest’s full name and address, and it will be sealed. The inner envelope will include only the guest’s title and last name (such as Mr. Smith) and will be left unsealed, as it is not gummed. This is also the envelope that you list the invited parties names ~ so, if Ms. Jones is being invited with a guest it would read Ms. Jones and Guest; if she was being invited as a single the inner envelope would only read Ms. Jones. If you are ordering double envelopes and wish to include an envelope liner, the inner envelope will be the lined envelope. This way the guests will get the full impact of a well designed invitation suite.