The Legendary Black Falcon is Ryu Hayabusa's default costume in the modern Ninja Gaiden games, replacing the original Hayabusa purple/blue costume from the classic games.
Although the details have changed between games the basic design is the same: A black or dark-grey, sleeveless, skin-tight jumpsuit with minor padding and straps toward the sides; kunai on the leg(s); arm and shin guards; fingerless gloves; hood and scarf obscuring most of the face; forehead protector bearing the insignia of a peregrine falcon and tabi boots.
It is the epitome of a modern ninja suit, technologically advanced, giving Ryu free movements and elasticity while providing enhanced resistance and protection.