To decorate a Christmas tree with mesh, you'll need a few supplies: a Christmas tree, mesh fabric, string lights, and ornaments. Start by wrapping the mesh around the tree in a criss-cross pattern, securing it with string at the top and bottom of the tree. Next, add some string lights to the tree, threading them through the mesh. Then, add some ornaments to the tree, using the mesh as a base to hang them from. Finally, add some finishing touches like bows or garland to make the tree look festive and complete. Enjoy your beautifully decorated Christmas tree!