It is customary not to say the blessing of She’hechiyanu during the Three Weeks. Therefore, one should avoid eating fruits that they have not eaten for a year, as this would necessitate saying the blessing. In addition, one should not wear new clothing that requires making the blessing of She’hechiyanu. This includes new suits and new coats. One may purchase these items during the Three Weeks, it is wearing them for the first time that is a problem. One may purchase and wear any other type of clothing during the Three Weeks.