Sahih Muslim Book 4, Hadith Number 1135.

Chapter : It is not advisable to pray wearing a cloth which has designs or markings over it.

Anas b. Malik reported: The Messenger of Allah (may peace be upon him) said: When the supper is brought before you, and it is also the time to say prayer, first take food before saying evening prayer and do not hasten (to prayer, leaving aside the food).