Aviator Cap

Head circumference = 56 cm. Size S fits snug. Size M was a little too far. From materials and workmanship there is nothing wrong. The cap is not very thick, but warms fairly well. The cap is reminiscent of an armored hood, just only thinner.
First criticism: The upper seams are not made as flat seams and give a thicker bead. For the price I would have expected flat seams. Second criticism: the neck about 3cm too long, lace light at head movement and ride up.
How to look like that? Just like a war veteran, missing only the oil-smeared face.
Keep warm the cap in any case, I had all the trappings but then something much and have returned their caps. A pair of glasses fit rather badly under the hood. It lacks holes for a pair of glasses.
Sizes:
S = 54-57 cm
M = 57-60 cm
L = 60-63 cm
The Table agrees about.
The S sat with me but a little tight.