Commodore John Paul Jones wearing the blue and white Continental Navy uniform that he designed in 1777. This particular uniform was favored by officers as it had gold trim and epaulets while the blue and red garb ordered by Congress in 1775 didn't (though Jones added gold braid and epaulets to his blue and red uniform anyway). A group of officers and Jones presented this idea to Congress in 1777 and it was politely struck down, blamed for too closely resembling Royal Navy uniforms and giving a too powerful appearance to naval officers. Shortly after the uniform's refusal, Jones and the other officers had sets personally made and wore them out of sight at sea... though they opted to omit the gold trim just in case they were seen wearing them (Jones however, the usual mavrick, made his as dashing and fancy as possible, even wearing an unauthorized red sash.)
It is believed that Jones was wearing this particular uniform when the Bonhomme Richard engaged the HMS Serphis at The Battle of Flambrough Head on September 23rd, 1779.