I got married last year in Scotland, and a whole group of us flew with Ryanair from Dublin to Edinburgh while carrying luggage, suits and the dress of course.
I'm no great fan of Ryanair (especially the check-in staff and the excess baggage desk staff) but the cabin crew couldn't have been more helpful.
We made sure we were one of the first on the plane (carrying a wedding dress naturally makes people sympathetic!) and the cabin crew reserved a few seats for our baggage and shooed the other passengers away.
Of course, it can't have been a full flight, but the attitude of the cabin crew was fantastic anyway.