Character Rigging

Meet Rika :smiley:. My first character after a few months learning Blender.

I tried to move her in Pose Mode after parent her to armature with automatic weights but her clothes seems like does not move her body very well. I have tried parenting her clothes to her body. It does not work. I also tried to join everything, but still, does not work well.

Is it because I made her clothes out of a new object? Do I need to remake Rika?

Joined her body her clothes