This is the closest I could find. It's hardly representative of his current attire, but it shows one costume. Here is his other:
Baric walks with a slight slump to his otherwise military posture, as though a weight rests on his dwarven shoulders. His traveling costume is that of a grizzled warrior, a hint of a scar made up on his left eye and a few tatters to his blue jerkin in choice places, denoting experience, but not poverty or sloppiness. The sleeves of his undershirt are rolled just above the elbow showing a few lines of common numerals tattooed on one forearm and a strange metal spiral on the other. Upon closer inspections, the numerals appear to be dates—some reaching more than a century back. On his other arm, the spiral appears to have scratched into his arm in places, leaving a light spiral of shallow scars.
His deep brown beard stretches to his waist, even braided into thick strands, and is tucked into a leather belt with a weathered war drum on one side and a detailed rapier sheathed on the other.
His eyes are lightly shaded beneath a wide-rimmed blue hat with a dark feather placed inside. His mouth is held at a slight smile, but his eyes are blank with a shadow of pain. He lets off an anxiousness that is not fearful or jumpy, but unrelaxed as though a restfulness he has found is about to be snatched from him.