It goes to the smiley that the group at the beginning of the nineties. In his new collection of Bootleg Redux Grunge has Jacobs garments with a smiley, which, according to Nirvana is similar to that of the band.
Nirvana has, since 1992, the rights to the yellow smiley. These are the eyes, two crosses and there is a small tongue out of the smiling mouth. Jacobs has the eye replaced by the letters M and J. Further, he used letters of the same font that Nirvana used for the name of the band on album covers and other media.
Incidentally, the band members also objected to the use of the term grunge by the American designer, appears from the documents that TMZ has realized.