Q. Can you wear the clothing of a deceased? Can you donate it to a charity that could give it to a Jewish needy?

A. Poskim write that there is no prohibition or a tradition not to wear he clothing of as deceased, it can therefore be used or donated to all. Yalkut Yosef (Avelus p. 385 and others) permit a son to wear the clothing of his late father.
Horav Shlomo Miller Shlit’a mentioned that we see the above reflected on Moshe Rabbenu dressing Aharon Hacohen’s garments upon his demise, on his son Elazar. (Bamidbar 20; 280.

Rabbi A. Bartfeld as revised by Horav Shlomo Miller Shlit’a