I attached my character to my armature with automatic weights and everything works as expected.
However, if I do the same with its clothes, the weights are completely wrong. Somehow, the hem of his shirt is connected to his left forearm.
I then tried to manually paint the weights instead, but it won't let me select any of the bones in weight painting mode. What could I be missing here? (Yes, I did select the armature, then the model when going into weight painting)
EDIT: This just got stranger. I managed to paint the weights manually, but the problem still happens. What's going on here?