For most wedding jobs, I use this traditional layout for envelopes. It is a staggered indent that allows for the lines to lead the eye down to the next line of the address. I find this to be very pleasing!
However, this address was not going to work with a staggered layout. You see, the second line takes the FULL size of the envelope to fit in the "world's longest" address (and I still wound up having to abbreviate a word). My only solution was to write out the address and then center each line. Many calligraphers offer to center addresses, however after this job . . . well, there would have to be an extra charge to cover the extra time to center each line.