The Cobalt Necktie is an item that appears in Mario & Luigi: Superstar Saga. It can only be obtained by making a different kind of espresso at Starbeans Café for the sixth time. Professor E. Gadd then appears to give the Cobalt Necktie to Mario and Luigi.
Despite the name, the Cobalt Necktie resembles a bow tie more of a regular necktie. It also appears to be grey in color.
While equipped, the Cobalt Necktie doubles the regular amount of 'Stache Points. This is useful as the more 'Stache Points, the luckier Mario or Luigi are.