When I buy something, I will ask to myself "Can I keep this for 40 years?" from now on. Of course, there are still some exceptions. It's a bit weird idea, but I realized that my family kept some things for 40 years.
For example, there are some plates that my parent have since they got married. One of my mother's coats was something my grandmother used to wear. My family has lived here for 45 years and my parent didn't reform our house.
This is my mother's coat :) It's still really comfortable to wear.
I found an interesting video from a minimalist channel. It's a crazy and neat idea.