The tape I use, is measuring my hip, 91CM. That's the amount of the ruler for the clothes.
1 feet, about 33cm, 91cm is usually wear 2 feet 8 pants, you see if jeans are 28 suitable.
The amount of tape and clothes ruler is the same, you look at the unit, such as checking is CM, that is not what is different, if you convert inches, click on it, one inch =0.0254m=2.54cm, if you write the hip 102 is CM, you should wear a lot, but not too tight.
Hip circumference 91 cm, waist circumference should be: 2 feet according to the standard: the calculation method is: hip circumference, -7 inches = waist.