Conversation so far:
what was Slipknot (band)'s image?
attention-grabbing image; the members perform wearing unique, individual facemasks and matching uniforms--typically jumpsuits.
what other things played a part in their image?
The concept of wearing matching jumpsuits has been described as a response to commercialism in the music industry and led to the idea of assigning the band members numerical aliases.

Question: What else were they known for?
Self-contained rewrite: Besides attention-grabbing image & members performance wearing unique jumpsuits, what else were the Slipknot (band) members known for?