The uniform includes robes which sport the colours of blue and cranberry. All robes are fastened by a gold Gordian Knot, which is the brooch Isolt found in the ruins of the original Ilvermorny cottage. The robes were designed by two of the founders, Isolt Sayre and James Steward. Isolt chose the colour blue because she wanted to be in Ravenclaw house had she attended Hogwarts and James chose cranberry because of his love for cranberry pie.
As evident by Ilvermorny students visiting MACUSA headquarters in December 1926, the Ilvermrony robes (at least as of 1926) come in two separate, solid colours, rather than being the same for all students. However, in the Sayre family portrait, the school robes worn by Chadwick and Webster Boot were identical, being mostly blue with cranberry red trim. They are also wearing black waistcoasts and brown breeches underneath their robes.