Supplication said to someone wearing a new garment
Recite:
تُبْلِي وَيُخْلِفُ اللَّهُ
"May Allah prolong your life so that this clothing become old
and may Allah give you other clothing after this".
(Hisnul Hasin from Abu Dawood)
Source/By :
Fortification of the Muslims through remembrance and supplication from the Quran and the Sunnah