Final answer:
Isaac pointing out Amir's expensive clothing probably serves to underscore social and status differences, and possibly to comment on cultural identity or conformity.
Step-by-step explanation:
The purpose of Isaac pointing out Amir's expensive clothing in the story "Disgraced" is likely to highlight issues related to class, status, and possibly cultural identity. Clearly, the narrative shows a preoccupation with appearances and what they suggest about a person's social position. By calling attention to Amir's clothing, Isaac may be attempting to make a statement about Amir's wealth and what it means in the context of their social interactions, or perhaps challenging any perceived notions of modesty or conformity.