There is a proverb in Telugu language which is as below.
అన్నం లేకపోయినా, పట్టుబట్ట కడతా అన్నాడట
It translates to someone who doesn't have a morsel to eat but insists on wearing expensive clothes. In short, a person who likes to show off but is disproportionate to his means.
What is the English equivalent proverb or idiom which conveys a similar meaning?