Chanel designer Karl Lagerfeld has criticised the dress sense of Germany's Chancellor Angela Merkel.

The German style guru offered the chancellor fashion advice after seeing the politician's wardrobe choice during a meeting with President Barack Obama in June.

Lagerfeld, 78, who regularly provokes controversy with his inflammatory views, insisted that Merkel should dress for her "special proportions''.

"Miss Merkel [should dress] according to her special proportions," he complained to German magazine Focus. "[When she was pictured with Obama], the proportions were bad, like the cut. The pants were too long."

Merkel is the latest high-profile woman to be targeted by the outspoken designer.

In 2012 Lagerfeld inflicted merciless criticism on the singer Adele and the Duchess of Cambridge's younger sister Pippa Middleton.

He branded the 'Skyfall' hitmaker a ''little too fat', while complimenting her ''beautiful face and divine voice'' at the same time.

He also insisted Middleton should ''only ever show her back'', and recently claimed: ''I think that her sister [Kate Middleton, Duchess of Cambridge] looks better.''

Lagerfeld's outrageous quotes have inspired a book soon to be published by Thames & Hudson - The World According to Karl.