Under what conditions fall skins? (Rust)

http://rust-wiki.com/How_Get_Skins
https://steamcommunity.com/app/252490/discussions/0/530649887195292701/

BIGeldak
Thank you

I almost every day play,and consistently some sort of bun every time falls.

What is skin - colored clothes or even just a good thing?

and what other games fall skins just for playing ?