I envied DJI microphones that they could hold onto a t-shirt with a magnetic clip. But since I don't want DJI microphones, I had to make a holder myself for my Comica microphones.

The magnets are opposite in both parts. Insert 4 magnets into the first part. Reverse the polarity. Insert 4 magnets into the second part. The reason is that the contact part is only 0.2 mm so that the magnets stick together well.