مَنْ لَبِسَ ثَوْبَ شُهْرَةٍ فِي الدُّنْيَا، أَلْبَسَهُ اللَّهُ ثَوْبَ مَذَلَّةٍ يَوْمَ الْقِيَامَةِ
Translation: Whoever wears a garment for ostentatious fame in this world, Allah will clothe that person in a garment of humiliation on the Day of Resurrection.
Source: أحمد وغيره
ثَوْبَ شُهْرَةٍ is a genitive construction: a garment worn to seek fame. لَبِسَ means “he wore,” whereas أَلْبَسَهُ means “He clothed him”; the derived verb expresses making another wear something. مَذَلَّةٍ means humiliation.
The warning is not against clean, attractive, or lawful clothing as such. Its focus is ostentation through dress: dressing primarily to attract notice, assert superiority, or collect admiration.