A suit and tie is suitable and usual in suicide
Going against Kendrick is suicide since there is no opposition to his skill. By going against Kendrick you’re walking into your own funeral so you should wear appropriate clothing hence the suit and tie.
A suit and tie is “suitable” using the word suit twice, clever wordplay (well let’s be honest, Barney did it first)
Suit and tie is suitable — he’s referencing broke stock brokers jumping off tall buildings and commiting suicide becasue they believe their lives are over.
To help improve the meaning of these lyrics, visit "Rigamortus" by Kendrick Lamar Lyrics and leave a comment on the lyrics box