attackfish

Muscular atrophy, and he's using them to give his legs bulk? maybe the skin is sensitive and pants would move too much and chafe? Maybe someone in the art department got lazy about drawing them separate (which is probably the most likely, let's face it)? Maybe he has muscular twitches, and strapping his legs together hides it. Maybe thy knock against each other too much when he flies (though he really should also be strapping them down) maybe it got to be a pattern, and he just never stopped doing it after they healed?