Mario and Luigi Halloween costume idea for toddlers. My little guys are going to dress up as Mario brothers for Halloween this year and I can’t wait! This costume was so easy! It comes with everything minus the shoes. My kids are 3 and 4 and ordered them a size medium! Halloween costumes , Halloween outfits , Mario costume , Luigi costume , kids costume , toddler boy costume , toddler Halloween costumes , Mario brothers costumes , Halloween LTKStyleTip LTKHalloween LTKKids