I have just been doing some retexturing and noticed a couple of things with the visibility modifer. I am presuming the lower the number the higher the advantage of wearing this item is:

Pressvest - the light blue pressvest seems to provide more of an advantage than the blue pressvest even though the blue is darker and harder to see. Generally I would have thought if something was dark it would have more of an advantage than something that is light in color.

Policevest - has no visibility modifer

M65 - the Tan M65 provides a bigger advantage over the black one which I don't think is right. In both Chernarus and Livonia I would have thought black would have provided better camoflage than Tan which is more desert focused. The Khaki m65 provides a much better advantage over the BDU which has a camo pattern. In fact the BDU is the same as the Tan