measuring your waist

Hello everyone,  I have a question.  When you go to measure your waist do you measure around where the belly button is or do you go up higher just under your breast.  I know this is probably a stupid question but I wasn't sure.

You measure the narrowest point - usually a couple inches above your belly button.

When we measured ourselves for gym class in HS we measured at our bellybutton as the wasit.

It's different for men and women.

See http://www.bblex.de/en/calc/navy.php

I measure 2 places for my waist.  The first is the smallest measurement between breasts and hips.  I consider this my "true" waist. 

Then I measure around at the belly-button.  I call that my "belly-button" waist.  Original right? 

I keep track of both and when entering the value in calculators for body fat or whatever, I try to find out what they want, and use the appropriate number.