The former artistic director has slammed the pop star for not emulating his sister's dress sense more.
Christopher designed the stages for some of the legendary performer's most memorable tours including Blonde Ambition and Girlie Show.
Rather than criticise Gaga for her 'borrowing' of Madonna's key looks in the past, Christopher has declared she has made a mistake in not following her example more carefully.
'What I would do with Gaga is stream it all down and get rid of all the c**p and make her a real person. It's cool on some level, but when you start out massively way over the top, there is nowhere to go,' Christopher told the Huffington Post. 'You get stuck there and you disconnect from the audience. You become this freak on the stage.'
Madonna’s outspoken sibling went on to explain why he thinks his sister has been so spot on with her image evolution. He declared that her trick is to present an aspirational yet attainable image to the public.
'You have to remember what really made Madonna really popular is that girls could dress like her. You can’t dress like Gaga, only on Halloween perhaps. It's a really big part of being a performer - getting your fans to follow you,' Christopher continued. 'You have to evolve. At one point with Madonna, it was time for the tights to go.'
Christopher has now turned his hand from designing tours to designing shoes. Never the less, the controversial fashion critic revealed there is one celebrity’s wardrobe he is desperate to get his hands on.
'I would love to overhaul Kelly Clarkson. I would certainly give her a style. She needs something,' Christopher admitted. 'The girl's got an amazing voice; it's just the girl comes onstage dowdy and there is no particular look to her. She could do so much better. I don't know if she doesn't care and that’s fine, I just feel there is so much more.'