How edit video/photo onto green body suit, shirt, or hat while actor is walking or sitting?

The foremost trick is to get the green evenly lit, in order to effectively remove it. Also, you need to shoot clean plates in order to be able to fill in keyed out areas. If the camera is moving, both the action and the clean plate need to be shot identically.

Most tricky issue will be to fill in parts that no longer exist after the green has been removed but are hard to shoot as a clean plate, such as the inside of a sleeve, neck piece or hat. The flatter the scene, the less challenges you face.

Nonetheless, it sounds like a fun shoot. Just don't let it grow into a post production nightmare. Test before you shoot the talent.

Hope this helps.

Honestly, I don't know if there is any specific instructions for "bodysuits" that's different than green screen instructions. A green bodysuit is just a wearable green screen. The video editor treats it the same way. The pros who have answered have pretty much given you everything you need. If you key out the suit the way you would a green screen, you'll get the result you want.

The only difference I can think of is that lighting might be trickier. It's difficult enough to light a stationary green screen correctly, to get even color and avoid too much shadow. Your lighting would need to be planned so that during the shoot, the actor is evenly lit no matter where they walk. But it sounds like you're past the shoot and you're in post production now. The directions are the same as with any green screen project.