Not sure it's his Orleans lancer uniform... The panel under the painting at "The Cabildo the Louisiana State museum" tells us it is his French army uniform (since he served in the French cavalry and this uniform looks French) http://1.bp.blogspot.com/-CQnXP3mER1U/UC7i3ZFF3II/AAAAAAAATqo/GG_qDdoc5RI/s1600/New+Orleans+061.jpg
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