The Olive Outfit is the standard outfit of the hunter. It is available and equipped right from the start. As all starting equipment, it can be choosen from the shop for no charge.
The outfit seems to be, as the other outfits, a kind of an allrounder, as it offers, as the description states, protection against harsh weather and low temperature. The plain coloration and the overall very green look seem to make it most suitable in grassy terrain rather than the woods.
As all outfits, it does not effect how well the hunter can be detected by animals.