Amee's right! Your villagers keep researching and gaining tech points and if you keep having your children pick up collectables you will have lots of tech points. So .... what do you do with them? Buy clothes!

I had my male builders in all the same outfit with the females in a matching color. I did the same for farmers, scientist, doctors and parents. When the person became a master and started to learn another function I would just change his/her outfit. Doing this made it easy to see who was goofing off.

When they became masters in three; they then were able to purchase a special outfit for Esteemed Elders Only.