Modesty' is one of the best quality. It is praiseworthy in this world as well as in the hereafter. It is said in the tradition that modesty is a part of Imaan'. Modesty and Imaan are inter-wind. If modesty is lost, Imaan is also lost. One who has four qualities will be blessed on the day of judgement even if he is a sinner from head to toe: Truthfulness,
modesty,
good character and
thankfulness to Allah (or Amanat)
(Usul-e-Kafi-2, p. 10)