We know that King is one of the members of the Seven Deadly Sins and is known as the Grizzly’s Sin of Sloth in Nanatsu no Taizai. And his fairy form is a young boy with short hair and orange eyes. Hence, thin and small cosplayer could pull off it easily.
And this simple cosplay costume that is composed of orange and blue coat with hood, plus blue short pants, is the typical outfit for cosplaying King from The Seven Deadly Sins. In additon, King carries a speial pillow with leopard pattern.
If you are into weapon cosplay idea, Nanatsu no Taizai King also has one, namly, his Scared Treaure is a spirit spear, Chastiefol. In one word, cosplay King is a cool and easy idea for both male and female cosplayers.