Making a hoodie with a hood but the hood moves weirdly

Hi.
As you see colors and their placement are not right

You can go about fixing it in two ways:
1). Select the hood in UV editor ( inside and outside ), separate it from the body ( P - selection ), unfold rig, select head mesh, transfer weights from the head to the hood, combine the hood with the rest of the hoody again, select the edge loop where they were separated, Tools - Remove doubles with 0,0001 value. Try it in the game again
or
2). Separate the hood, transfer the weights from a shirt again to the hoody, then paint the hood with Weight Gradient tool, just neck and head vertex groups. If you don't know how, you can see in this video starting from 7:43 to 8:25

1). I assume the game crushes bc the file is somehow corrupted, i don't think weight can do this. So i suggest to start a new project, this time from a simple shirt bc it has only one s4studio_mesh_1 which makes life easier.
2). I didn't notice initially that s4studio_mesh_2 - 5 were parts of the body underneath the hoody and not the hoody itself. You don't need them. Just delete all of them.
3). Both advices i gave you were bullshit, it seems that one cannot transfer weight directly from head and the hood would have different groups than just head and neck, so here's a detailed explanation:

- delete s4studio_mesh_2 - 5 meshes in your hoody scene;
- start a new project from this shirt ( 1 ), export mesh, append it in your scene, delete rig.001 and bone_bone_shape.001;
- select the hoody and delete all vertex groups ( 2 );
- to prevent creases from happening in game i recommend to always remove doubles ( on the mesh you're transferring TO only ) before transferring weights. Here's how:

- select reference mesh, Shift- select the hoody, go to weight paint mode, choose transfer weights ( 3-4 ) and clean tools ( 5-6 )

- In Edit mode, with Keep UV and edit mode mesh selection in sync enabled ( 1 ), select all parts of the hood in Uv Editor ( 2 ), find b__Neck__ ( 3 ) and hit Remove button( 4 ).

- Go to Weight Paint mode and with b__Neck__ selected use Normalize all ( 1 ) first and then Clean ( 2 ). Switch to side ( 3 on your keyboard ) orthographic ( 5 on your keyboard ) view, select b__Head__ and with Weight gradient tool ( 3 ) set to 1 (for weight and strength) start dragging the line from the middle of the hood to the shoulders. Then select Subtract brush and do the same but from the shoulders to the middle( just like orange line )

- it looks ok but you can smooth the area between the hood and the rest even further with Smooth brush.

- select blue edges and split them as explained earlier. Delete reference. Import into your new project instead of the shirt.

Also, you must have noticed that there's a shadow where ears used to be. It can be fixed by just moving one vertex, but i thought i'd show you a couple of hotkeys to make mesh and uv editing easier