A tape measure.
You would use a fabric tape measure as used by tailors and dressmakers. Available in stores like Walmart.
Most of the time you measure around the biggest part of your waist, which would be about your bellybutton area.
No. You would use different units of measurement. You would measure the size (circumference) of your waist (for trousers) in centimetres. You would not measure the distance to the moon in centimetres!
A cloth tape measure.
You can buy some tapes from most retail stores and they measure your waist size in inches.
Measure your waist and inseam.
The length of a pencil. your waist/chest measurement the dimensions of a table
To measure something long, big or size of a people. By measuring the waist.
You can measure your waist that way.
A tape measure.
Just try it on and whatever size fits, or you can do it the hard way and measure your waist with a tape measure and go measure their selection of jeans.
I would use a fabric tape measure.I would use a fabric tape measure.