Russian uniforms has two sizes, one for width and one for height. They are most often given as a pair of numbers, for example 56-4 or 54-182.
The width sizes is given in a number that equals the width of your chest, that means half of its circumference.
Meassure the circumference of your waist and chest and compare to the table below. If the two meassurements give you different sizes according to the table, choose the larger size.
There are two systems used; one is a single number, the other is a three digit number. Which version is used depends on the manufacturer and garment.
Meassure your height and compare to the table below.
This is the sizes used for headwear.
Meassure the circumference of the widest part of your head and compare to the table below.