I vaguely recall reading that mailing them two copies of the same shirt was a surefire way to get them to change into it. Anyone know any solid methods, via firsthand experience or a link? Thanks!
Yeah,sending them multiple copies of the same shirt usually works but it's not 100%.I send at least three shirts to improve my chances.Another way to get them to change is to give them a shirt in their preferred color and style on their birthday.I use Thonky for that purpose:
Villagers are more likely to wear clothing they receive on their birthday if you have a high level of friendship with them.Another method is carrying the shirt you want your villager to wear in your pockets and hoping the villager pings and asks to buy or trade for the shirt.That method takes a while and there are no guarantees that the villager will actually change into the shirt once they get it from you.Here's a link to an older thread that has some more answers: