How do you change your villager's clothes? I've tried a few times but I can't seem to figure out which keys to push...Eh?

For VV1: Select a villager (so that the white circle is underneath him/her) and press F6. Just remember, you can only go forwards, so once you get to the end of the line, the villager is stuck with them clothes.

For VV2: You need a certain puzzle completed for this. Take villager to the puzzle and he/she can change his/her clothes.

EDIT: On second looking, maybe I didn't have to do the instructions for VV2. LOL.