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.
What else were they known for?
Several band members have said wearing the masks helps to maintain privacy in their personal lives.
Were they successful?
The band's image has been the subject of much criticism and controversy, with critics generally accusing it of being a sales gimmick.
How did they respond to that accusation?
The band's members object to these claims; according to them the masks are used to divert attention from themselves and put it on the music.
Have they won any awards?
CANNOTANSWER.
What else is noted about them?
The band has said the idea of wearing masks stemmed from a clown mask that Crahan took to rehearsals when the band first started.
When did the band start?
CANNOTANSWER.

Question: Do they all wear masks?
Self-contained rewrite: Do all members of the Slipknot (band) wear masks?