Best of luck! Love to see more Dutch regiments popping up! Some info on the uniforms, given your name I'm assuming you're a regiment for the Kingdom of Holland? The uniform for the 3rd regiment would be white with blue facings (pictures in the spoiler)
Just a note, the image of the infantrymen with blue coats are Dutch/Belgians from the Waterloo campaign who fought for the United Kingdom of the Netherlands at Waterloo in 1815. They're still Dutch just with the addition of Belgians and they fought against Napoleon this time.