Gorget/bevor is a very distinctive feature among polish soldiers, uncommon in other factions.
Ot's this type of amor that is not really to protect, but is kind of a relict of the past, a symbol of knighthood, that polish nobility likes to wear to show that they are descendants of the medieval knights or that they are knights themselves.
So it's like men nipples really, kinda we don't need tham for anything, but they are they and we would look stupid without them ;)
And we have them because our fast evolution allowed us not to use them, but our prehistoric ancestors probably did ;)