This is one of my favourite things to do with an old silk sari and it's also something that I have personally tried with three of my mother's old pieces.
Of course, the way you design an anarkali depends entirely on your personal choice.
But we would suggest that a floor length anarkali would be perfect if you are re-purposing an old silk sari. That way you can flaunt the entire design and those big borders to make it all look ethereal.
Photograph: Kind Courtesy Gaurang Shah/Instagram