Madonna’s son wants to wear her clothes….That can’t be a good sign of things to come….

The Material Girl says David Banda, the 4-year-old tot she adopted from Malawi nearly three years ago, is one of her most devoted fans and fascinated by the outfits she wears on-stage.

“He knows every song, every word, every step, and he wants to wear all the costumes. He likes my dress that I wear in ‘La Isla Bonita,’” Madge told London’s GMTV on Wednesday.