Is wearing a Shirt and pant where the figure of the body is discernible permissible? I have heard from many of the elders that its haram due to shape visibility. So what is the source for such ruling?
In the name of Allah, the most compassionate, the most merciful
Briefly speaking, as the answer of your query as you asked:
Is wearing pants and shirts allowed?
According to the verdicts of almost all Maraaje’-Taqlid of Shia, it is not permissible to wear the mentioned types of clothes. For instance, you can see some of those verdicts in the following link (in Arabic):