If you got one of the dresses during the Ring of Oath event then you can use one of those but it has to be tagged "wedding"

You can go to the Stylist Arena and compete. You get gold regardless if you win or lose, also enter in the competition and you can gain gold from voting (just hit the little gift icon at the bottom), and if you've unlocked Decomposition under the Recipe Workshop it'll give you coins for decomposing items. Achievements will give you coins too and I can't really think of anything else

Go back to 1-6 Maiden and it'll unlock the pack. It has a 24 hour timer then you can claim it