Invocation (Dua) when putting on New Clothes :
Allaahumma lakal-hamdu 'Anta kasawtaneehi, 'as'aluka min khayrihi wa khayri maa suni'a lahu, wa 'a'oothu bika min sharrihi wa sharri ma suni a lahu.
Meaning of dua :
O Allah, praise is to you. you have clothed me. i ask you for its good ness and the goodness of what it has been made for , and , I seek your protection from evil of it and the evil of what it has been made for.