Kathryn's Kreationz

For truly formal events, there are certain rules of etiquette that are observed when writing an invitation. For less formal situations you can be more creative. Here are some things to remember when you're composing a formal invitation:

Write out names in full, including middle names. Omit a middle name if necessary, rather than using an initial.
It's appropriate to use the British spelling for "honour" and "favour", unless you prefer to use the American spelling of these words.
Spell out all words, including the hour, the date and the year. Spell out all words in the address, including Street, Road and Avenue. The two exceptions to this rule in an address are Saint (St.) and Mount (Mt.)
Use Roman numerals in names, rather than "the third" or "3rd."
For ceremonies taking place in a house of worship, use "request the honour of your presence." Ceremonies taking place in a non-religious setting should say, "request the pleasure of your company."

Envelope Addressing
Unsure of how to address wedding invitations? Below are various examples of the wording for formal wedding invitation outer and inner envelopes.

Single Guests
Unmarried Woman over 18	Miss Danielle Aspen
Divorced Woman who retains her maiden name	Ms. Kate Dean
Divorced Woman who uses her married name	Mrs. Renee Lewis
Unmarried or Divorced Man	Mr. Scott Howell
Couples
Married Couples	Mr. and Mrs. Thomas Valen
Married Couple - when the woman kept maiden name	Mr. Allen Conover and Mrs. Allison Smythe
Couples who do not share the same residence. You should send the invitation to the main friend being invited	Miss/Ms. Amanda Fallon and Guest or Mr. Thomas Gonzalez and Guest
Unmarried couples who live together address. You should send the invitation to the main friend being invited or if both are friends, the alphabetically by last name	Miss/Ms. Amy Carter and Mr. John Stevenson or Mr. Timothy Abbott and Miss Jeanine Whalen
Same gender couples - alphabetically by last name	Miss/Ms. Francine Mason and Miss/Ms. Sherri Quince or Mr. Tom Nelson and Mr. Zachary Stephens
Children over 18 years old should be considered adults and receive their own invitation, even if still at the home of their parents who will also be invited to your wedding	Miss Connie Jones or Mr. Bryan Denton
Other
Judge (single) Judge (married)	The Honorable Phillip Armande The Honorable and Mrs. Phillip Armande
Doctors Medical Single Married Female Married Couple (both doctors ) Married Woman (kept maiden name) Doctors Ph.D	Doctor Parker Flynn Doctor Parker Flynn and Mr. Alec Tucker Drs. Samuel and Maureen Harris Dr. Catherine Nelson and Mr. Manuel Gomez Same as medical, except that Doctor is spelled out.
Married Couple, Both Doctors	Doctors Sam and Mary Hepler
Clergy Single Married	Reverend Carl Wilson Reverend and Mrs. Carl Wilson or Reverend and Mr. Tanner Bastian
Military (it is whatever title they are, i.e. 1st Lieutenant, Major, etc.)	General and Mrs. Barry Lynch or Captain Jane Davis and Mr. Carl Davis