مَنْ تَحَلَّى بِمَا لَمْ يُعْطَ، كَانَ كَلَابِسِ ثَوْبَيْ زُورٍ
Translation: Whoever pretends to possess what they have not been given is like one wearing two garments of falsehood.
Source: الترمذي
تَحَلَّى means presenting oneself as adorned with a status or quality; بِمَا لَمْ يُعْطَ refers to what one was never actually given. In كَانَ كَلَابِسِ, the prefixed كَـ introduces a comparison: “like someone wearing.” ثَوْبَيْ زُورٍ means two garments of falsehood or pretense.
The garments are an image for creating a misleading appearance, not merely a discussion of clothing. Pretending to possess wealth, learning, honors, or charitable achievements one does not have illustrates the same fault.