Billy wears a scruffy blue (almost purple) vest.
It's cut to show off his muscles.
He wears blue jeans with a brown leather belt.
Billy has a pair of handcuffs around his left wrist.
He has a silver dog tag on a chain around his neck.
He wears dark leather shoes or boots.
The whole of his right arm is coverd in a complex tribal tattoo,
which you can see in some of the shots below.
The tattoo says "Mother Love".
Billy in The Umbrella Chronicles