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 The loops are calculated  through the stretching factor  according to the description of Lenchik2 from Osinki. 1) Knit a pattern: Type 20 stocking loops! (on the front-face, and on the inside-out), knit rows of 10-15. 
2) Measure the head circumference and neck circumference. 
3) Now the calculation: Sample: for example, from 20 loops = 8 cm, we stretch the sample strongly and measure (it turned out = 12.5 cm). We calculate the stretching factor: Cr = 8 cm / 12.5 cm = 0.64 
4) 56 cm (About the head ) * 0.64 = 36 cm we need (we need to add another 4 cm so that it can be easily removed and put on (it is always, for any size, you can add 5 instead of 4 cm). We need to get 40 cm (36 + 4) ). When stretching will be 62cm (40 / 0.64)). 
5) Calculation of loops: 20pet = 8cm; we need 40cm * 20/8 = 100 loops and knit a rubber band ...
DIRECT HURED 100 loops, and do not be afraid that you will have to dress up ... 

      Spokes circular 3.0 mm
   I use one more nuance when knitting the neck of the shirtfront:

     Having finished knitting with an elastic band (in this case 2x2), I knit 4-6 rows of a hollow gum.

  The beginning of the pattern consists of 8 loops. In the first front row for a hollow gum and add 4 more loops (104/8 = 13). I got 13 rappoports.