Thank Allah and make Dua when putting on new clothes - You get reward.

It is Sunnah for the one who is putting on a new garment to thank Allaah and make du’aa’. 

When the Prophet (peace be upon him) put on a new garment, he would call it by its name, whether it was a turban, a shirt or a cloak, then he would say:

Allaahumma laka al-hamd anta kasawtanihi as’aluka khayrahu wa khayri ma suni’a lah wa a’oodhu bika min sharrihi wa sharri ma suni’a lah

(O Allaah, to You be all praise. You have clothed me with it. I ask You for the good of it and the good for which it was made, and I seek refuge with You from the evil of it and the evil for which it was made).

(al-Tirmidhi | 1767 | Abu Dawood | 4020)