I don't mean choosing items from stores that don't bother to list measurements. That's a wild guess at best. How do you use measurement info to your advantage? Are there any rules you usually follow? For example, which measurements do you consider essential? How much info do you need to make a good decision? Also, what about shops that take the measurments of an item laid flat. Why can't you just double these measurements to get the 3D measurements? In my experience you can't. What are your tips?