The Los Angeles-based designers, who have worked with Jackson for the last 20 years, had been creating costumes for the late pop star's This Is It comeback concerts in London.
A private family funeral will be held on Tuesday morning in Los Angeles before a public memorial at the Staples Center.
Reports suggest that Jackson will be laid to rest in a replica of James Brown's bronze casket at Forest Lawn Memorial Park in the Hollywood Hills, where his grandmother was buried in 1990.
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