Ours were always , as Jordana says, ‘ Mr & Mrs Blank request....’, but latterly we’ve had ones like, ‘ Hi there! Girl & Boy are getting married, and would love you to join us’, or something similar.
I liked the old way, and my mother insisted the invitations all said, ‘ request the pleasure of your company’, with the name(s) being written on the envelope. Space left on the invitation card for the guests’ names was ‘common’, apparently, as were cards which were anything other than plain heavy white card with silver edging and lettering!
Oh, and acceptance had to be by hand-written letter, thanking Mrs & Mrs for the invitation,repeating the invitation wording, and having ‘ much pleasure in accepting’!