I know how frustrating collectable can be, Aurora. When I was playing VV2, I had just one thing left and it literally took me upwards of 5 months to finally get it. Once I found that last piece, I cannot tell you the overwhelming joy I felt. It seems that when you are down to just once thing to finish a collectable, it is like the "a watched pot never boils" situation. Try not to spend to much specific time looking for it but instead, play with the village. Make some more potions. Change your villagers clothes, and every so often just skim by and see if your last piece has shown up. If not, Oh well... Just know it will show up sooner or later and the satisfaction will be great!