The singer-songwriter told Metro that some mistake her "therapeutic" sense of style for craziness.
"When I'm going through difficult situations I've always dressed up to sort of face them and go into battle," she said.
"It gives me a confidence I don't have. I think sometimes people have interpreted it properly and other times they haven't but when people sort of think I'm mentally ill.... maybe they don't have the courage to just run with a silly whim."
She added: "They like to brand me as crazy or whatever - they call me kooky! I'm quite level-headed.
"You can't brand somebody as mad because they dress a certain way. It actually warrants a conversation."
Around the release of her first album in 2010, Faith told Digital Spy: "I have a mild issue with the expectation of me being this crazy person because among my friends I'm one of the most grounded and in control of what I do.
"I think what makes me different from the average Joe is that I feel free to be myself and express myself in the way that I want. If that makes you mad, we're living in a world of dire straits. If anything it makes you more sane."