It is forbidden to make new clothing during the Nine Days...

Nshei Chabad Newsletter / It is forbidden to make new clothing during the Nine Days, even through a non-Jew. In case of great necessity, such as for a wedding right after Tisha B'Av, it is permissible, but through a non-Jew (Kitzur Shulchan Oruch, Ch. 122 Par. 10).