Choosing accessories to wear with your brown suit isn’t rocket science, and many of the conventions of yesteryear have fallen by the wayside. You can make almost anything work.  But, brown shoes go best with a brown suit. Lighter brown shoes and ties go quite well with darker suits, and darker shoes and ties go well with lighter brown suits. Throw in a nice belt, and you are good to go.  Brown is a versatile color, so you can consider a range of shirt colors, including white, gray, blue, pink, and even green.