And they wonder why I keep dressing like Elvis
In the 50s, Elvis' clothes were baggy. Em often compares himself to Elvis: a white man being successful in a black music genre.
Also, in the previous lines, Eminem states that he “Made a mess in his trousers” meaning he jizzed himself. While jizz is white, he says he dresses like elvis, in all white, to hide the jizz stains.
Eminem is referring to when he dressed like Elvis on the “Without Me” music video.
As well as on the music video of this song.
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